Make Android examples depend on source again

Summary: @​public

The idea was to depend on a fixed version from Maven to make running the examples easy, however that only works if we depend on both fixed version of JS and the Android artifacts.

The current way leads to version mismatches and causes confusion: https://github.com/facebook/react-native/issues/3329

This commit makes the Android examples consistent with iOS (always build the latest JS and native code from master).

Added docs here: 8abfb5e0e2

Reviewed By: @foghina

Differential Revision: D2531525

fb-gh-sync-id: 7c0844b63ddeb94ad008a3f0e7a43e1af69031c4

Examples/Movies/android/app/build.gradle

@@ -26,10 +26,6 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:23.0.1'
 
-    // Depend on pre-built React Native
-    compile 'com.facebook.react:react-native:0.11.+'
-
-    // Depend on React Native source.
-    // This is useful for testing your changes when working on React Native.
-    // compile project(':ReactAndroid')
+    // Build React Native from source
+    compile project(':ReactAndroid')
 }

Examples/UIExplorer/android/app/build.gradle

@@ -26,10 +26,6 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:23.0.1'
 
-    // Depend on pre-built React Native
-    compile 'com.facebook.react:react-native:0.11.+'
-
-    // Depend on React Native source.
-    // This is useful for testing your changes when working on React Native.
-    // compile project(':ReactAndroid')
+    // Build React Native from source
+    compile project(':ReactAndroid')
 }