Fix the connectedCheck build target

1) Create a new build type for testing.
2) Only obfuscate the package android.support.v7.internal.view.menu
   to prevent LGE ROM bug
3) '-keepattributes Exceptions' to allow for throwing from mocks
4) -dontskipnonpubliclibraryclassmembers and -dontwarn for
   everything else

Fixes #2871
Closes #2986

// FREEBIE

build.gradle

@@ -127,6 +127,7 @@ dependencyVerification {
 android {
     compileSdkVersion 22
     buildToolsVersion '22.0.1'
+    testBuildType "testing"
 
     dexOptions {
         javaMaxHeapSize "4g"
@@ -188,6 +189,10 @@ android {
                           'proguard.cfg'
             signingConfig signingConfigs.release
         }
+        testing.initWith(buildTypes.debug)
+        testing {
+            proguardFile 'proguard-testing.pro'
+        }
     }
 
     sourceSets {