Bug 1233882 - Post: Update Android Gradle plugin to 1.5.0. r=me

MozReview-Commit-ID: 96Ot6X6d3rl

--HG--
extra : rebase_source : b6340af68a8116bc24e5a3ea1fd14dc6233bc09d
extra : histedit_source : fa5d973eda1ba57ca6254e8922cc0343c1998a39

build.gradle

@@ -25,7 +25,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.0'
+        classpath 'com.android.tools.build:gradle:1.5.0'
         classpath('com.stanfy.spoon:spoon-gradle-plugin:1.0.4') {
             // Without these, we get errors linting.
             exclude module: 'guava'