Update buildToolsVersion and gradle version

Author: jkasten2

.travis.yml

@@ -5,12 +5,16 @@ android:
   components:
     - platform-tools
     - tools
-    - build-tools-23.0.2
-    - extra-android-support
+    - build-tools-23.0.3
     - extra-android-m2repository
     - extra-google-m2repository
     - android-23
   licenses:
     - '.+'
-before_install: cd OneSignalSDK/app
+before_install:
+    - wget http://services.gradle.org/distributions/gradle-2.10-bin.zip
+    - unzip gradle-2.10-bin.zip
+    - export GRADLE_HOME=$PWD/gradle-2.10
+    - export PATH=$GRADLE_HOME/bin:$PATH
+    - cd OneSignalSDK/app
 script: gradle build

OneSignalSDK/app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion "23.0.3"
 
     defaultConfig {
         applicationId "com.onesignal.example"

OneSignalSDK/build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.0'
+        classpath 'com.android.tools.build:gradle:2.1.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

OneSignalSDK/onesignal/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion "23.0.3"
 
     defaultConfig {
         minSdkVersion 9