prefer build.gradle with Android Plugin as source of package/version/code

These days, the location that overrides all the others is in the android{}
block of the build.gradle file that loads the com.android.application
plugin.  So this should be the preferred place to read these values.

test files GPL licensed: https://github.com/Integreight/1Sheeld-Android-App

tests/source-files/com.integreight.onesheeld/pagerIndicator/build.gradle

@@ -0,0 +1,22 @@
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.3"
+
+    defaultConfig {
+        minSdkVersion 9
+        targetSdkVersion 9
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+        }
+    }
+}
+
+dependencies {
+    compile 'com.android.support:support-v4:25.1.0'
+}