diff --git a/README.md b/README.md
index 8f96a97..aea640d 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,19 @@ Request additional libraries through issues. Pull requests are welcome.
 [![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-android--proguard--snippets-brightgreen.svg?style=flat)](https://android-arsenal.com/details/3/1242)
 
 ### Usage
+
+#### 1. Include the proguard files in your project
+First of all, add the repository as a git submodule (or just copy the proguard files in your project).
+
+#### 2. Integrate the proguard files in your project
 ```groovy
 android {
   buildTypes {
     release {
       minifyEnabled true
       // Library specific proguard files
-      proguardFile 'proguard-google-play-services.pro'
-      proguardFile 'proguard-gson.pro'
+      proguardFile '$PATH_TO_THE_PROGUARD_FILES/proguard-google-play-services.pro'
+      proguardFile '$PATH_TO_THE_PROGUARD_FILES/proguard-gson.pro'
       ...
       // Default proguard files & project app specific rules,
       //  see examples folder for more information
@@ -32,8 +37,7 @@ android {
 
 Instead of declaring each configuration file manually, you could also store them in a seperate directory and include them all at once:
 ```groovy
-FileCollection proGuardFileCollection = files { file('./proguard').listFiles() }
-proguardFiles(proGuardFileCollection)
+proguardFiles fileTree(dir: "$PATH_TO_THE_PROGUARD_FILES", include: ["*.pro"]).asList().toArray()
 ```
 
 ### Libraries
diff --git a/libraries/proguard-butterknife-8.pro b/libraries/proguard-butterknife-8.pro
new file mode 100644
index 0000000..e3f1d95
--- /dev/null
+++ b/libraries/proguard-butterknife-8.pro
@@ -0,0 +1,10 @@
+#ButterKnife 8
+
+# Retain generated class which implement Unbinder.
+-keep public class * implements butterknife.Unbinder { public <init>(...); }
+
+# Prevent obfuscation of types which use ButterKnife annotations since the simple name
+# is used to reflectively look up the generated ViewBinding.
+-keep class butterknife.*
+-keepclasseswithmembernames class * { @butterknife.* <methods>; }
+-keepclasseswithmembernames class * { @butterknife.* <fields>; }
\ No newline at end of file
diff --git a/libraries/proguard-dart.pro b/libraries/proguard-dart.pro
new file mode 100644
index 0000000..3b5b7c5
--- /dev/null
+++ b/libraries/proguard-dart.pro
@@ -0,0 +1,13 @@
+## Dart 2.x
+# https://github.com/f2prateek/dart#proguard
+
+-dontwarn com.f2prateek.dart.internal.**
+-keep class **$$ExtraInjector { *; }
+-keepclasseswithmembernames class * {
+    @com.f2prateek.dart.* <fields>;
+}
+
+#for dart 2.0 only
+-keep class **Henson { *; }
+-keep class **$$IntentBuilder { *; }
+
diff --git a/libraries/proguard-dbflow-4.0.5.pro b/libraries/proguard-dbflow-4.0.5.pro
new file mode 100644
index 0000000..56beb6b
--- /dev/null
+++ b/libraries/proguard-dbflow-4.0.5.pro
@@ -0,0 +1,8 @@
+# Proguard Configuration for Dbflow 4.0.5
+
+-keepattributes Annotation
+
+-keep class * extends com.raizlabs.android.dbflow.config.DatabaseHolder { *; }
+
+-keep class net.sqlcipher.** { *; }
+-dontwarn net.sqlcipher.
diff --git a/libraries/proguard-gson.pro b/libraries/proguard-gson.pro
index 2248c58..694025f 100644
--- a/libraries/proguard-gson.pro
+++ b/libraries/proguard-gson.pro
@@ -1,5 +1,4 @@
-## GSON 2.2.4 specific rules ##
-
+##---------------Begin: proguard configuration for Gson  ----------
 # Gson uses generic type information stored in a class file when working with fields. Proguard
 # removes such information by default, so configure it to keep all of it.
 -keepattributes Signature
@@ -7,8 +6,17 @@
 # For using GSON @Expose annotation
 -keepattributes *Annotation*
 
--keepattributes EnclosingMethod
-
 # Gson specific classes
 -keep class sun.misc.Unsafe { *; }
--keep class com.google.gson.stream.** { *; }
+#-keep class com.google.gson.stream.** { *; }
+
+# Application classes that will be serialized/deserialized over Gson
+-keep class com.google.gson.examples.android.model.** { *; }
+
+# Prevent proguard from stripping interface information from TypeAdapterFactory,
+# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
+##---------------End: proguard configuration for Gson  ----------
\ No newline at end of file
diff --git a/libraries/proguard-itext.pro b/libraries/proguard-itext.pro
new file mode 100644
index 0000000..b82bd4e
--- /dev/null
+++ b/libraries/proguard-itext.pro
@@ -0,0 +1,25 @@
+# Proguard Configuration for iText 5.5.11
+
+-keep class org.spongycastle.** { *; }
+-dontwarn org.spongycastle.**
+
+-keep class com.itextpdf.** { *; }
+
+-keep class javax.xml.crypto.dsig.** { *; }
+-dontwarn javax.xml.crypto.dsig.**
+
+-keep class org.apache.jcp.xml.dsig.internal.dom.** { *; }
+-dontwarn org.apache.jcp.xml.dsig.internal.dom.**
+
+-keep class javax.xml.crypto.dom.** { *; }
+-dontwarn javax.xml.crypto.dom.**
+
+-keep class org.apache.xml.security.utils.** { *; }
+-dontwarn org.apache.xml.security.utils.**
+
+-keep class javax.xml.crypto.XMLStructure
+-dontwarn javax.xml.crypto.XMLStructure
+
+-keep   interface com.itextpdf.**
+
+-dontwarn com.itextpdf.**
diff --git a/libraries/proguard-opencsv.pro b/libraries/proguard-opencsv.pro
new file mode 100644
index 0000000..570a51b
--- /dev/null
+++ b/libraries/proguard-opencsv.pro
@@ -0,0 +1,3 @@
+# Proguard configuration for openCSV
+
+-dontwarn org.apache.commons.beanutils.**
diff --git a/libraries/proguard-parceler.pro b/libraries/proguard-parceler.pro
index 80fccd6..233ccfb 100644
--- a/libraries/proguard-parceler.pro
+++ b/libraries/proguard-parceler.pro
@@ -1,8 +1,13 @@
 # Parceler rules
 # Source: https://github.com/johncarl81/parceler#configuring-proguard
 
--keep class * implements android.os.Parcelable {
-    public static final android.os.Parcelable$Creator *;
-}
-
+-keep interface org.parceler.Parcel
+-keep @org.parceler.Parcel class * { *; }
+-keep class **$$Parcelable { *; }
 -keep class org.parceler.Parceler$$Parcels
+
+-dontwarn org.parceler.apache.commons.**
+-dontwarn org.parceler.ParcelAnnotationProcessor
+-dontwarn org.parceler.transfuse.bootstrap.BootstrapProcessor
+-dontwarn org.parceler.codemodel.util.SingleByteEncoder
+-dontwarn java.beans.**
diff --git a/libraries/proguard-rx-java.pro b/libraries/proguard-rx-java.pro
index 73bfaba..4ead3ca 100644
--- a/libraries/proguard-rx-java.pro
+++ b/libraries/proguard-rx-java.pro
@@ -1,5 +1,13 @@
-# RxJava 0.21
-
+# RxJava 1.2.4
+ 		 
+-keepclassmembers class rx.internal.util.unsafe.*ArrayQueue*Field* {
+    long producerIndex;
+    long consumerIndex;
+}
+-keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef {
+    long producerNode;
+    long consumerNode;
+}
 -keep class rx.schedulers.Schedulers {
     public static <methods>;
 }
diff --git a/libraries/proguard-square-okhttp3.pro b/libraries/proguard-square-okhttp3.pro
index 64e6852..112b4aa 100644
--- a/libraries/proguard-square-okhttp3.pro
+++ b/libraries/proguard-square-okhttp3.pro
@@ -1,6 +1,3 @@
 # OkHttp
--keepattributes Signature
--keepattributes *Annotation*
--keep class okhttp3.** { *; }
--keep interface okhttp3.** { *; }
--dontwarn okhttp3.**
\ No newline at end of file
+-dontwarn okhttp3.**
+-dontwarn javax.annotation.*
\ No newline at end of file
diff --git a/libraries/proguard-square-okio.pro b/libraries/proguard-square-okio.pro
index 589e679..bf45861 100644
--- a/libraries/proguard-square-okio.pro
+++ b/libraries/proguard-square-okio.pro
@@ -1,5 +1,2 @@
 # Okio
--keep class sun.misc.Unsafe { *; }
--dontwarn java.nio.file.*
--dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
--dontwarn okio.**
\ No newline at end of file
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
\ No newline at end of file
diff --git a/libraries/proguard-square-retrofit2.pro b/libraries/proguard-square-retrofit2.pro
index 586c0f8..57ea6f5 100644
--- a/libraries/proguard-square-retrofit2.pro
+++ b/libraries/proguard-square-retrofit2.pro
@@ -1,11 +1,9 @@
 # Retrofit 2.X
 ## https://square.github.io/retrofit/ ##
 
--dontwarn retrofit2.**
--keep class retrofit2.** { *; }
--keepattributes Signature
--keepattributes Exceptions
-
--keepclasseswithmembers class * {
-    @retrofit2.http.* <methods>;
-}
+# Platform calls Class.forName on types which do not exist on Android to determine platform.
+-dontnote retrofit2.Platform
+# Platform used when running on Java 8 VMs. Will not be used at runtime.
+-dontwarn retrofit2.Platform$Java8
+# Retain generic signatures used for parsing the return types reflectively.
+-keepattributes Signature
\ No newline at end of file
diff --git a/libraries/proguard-viewpagerindicator.pro b/libraries/proguard-viewpagerindicator.pro
new file mode 100644
index 0000000..4ef9de3
--- /dev/null
+++ b/libraries/proguard-viewpagerindicator.pro
@@ -0,0 +1,4 @@
+#View Pager Indicator
+# https://github.com/JakeWharton/ViewPagerIndicator/issues/366#issuecomment-159972837
+
+-dontwarn com.viewpagerindicator.LinePageIndicator
\ No newline at end of file