Try to create a better configuration for Travis CI

Author: MichaelRocks

.travis.yml

@@ -1,15 +1,10 @@
 language: android
 
-before_install:
-  - echo yes | android update sdk --filter extra-android-m2repository --no-ui --force > /dev/null
-
-install:
-  - true
-
 android:
   components:
-    - build-tools-23.0.0
+    - build-tools-23.0.3
     - android-23
+    - extra-android-m2repository
 
 jdk:
   - oraclejdk7

library/build.gradle

@@ -31,7 +31,7 @@ targetCompatibility = JavaVersion.VERSION_1_6
 
 android {
   compileSdkVersion 23
-  buildToolsVersion '23.0.0'
+  buildToolsVersion '23.0.3'
 
   defaultConfig {
     minSdkVersion 4

sample/build.gradle

@@ -18,7 +18,7 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion 23
-  buildToolsVersion '23.0.0'
+  buildToolsVersion '23.0.3'
 
   defaultConfig {
     applicationId 'io.michaelrocks.callme.sample'