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 {

proguard-appcompat-v7.pro

@@ -1,8 +1,9 @@
+# https://code.google.com/p/android/issues/detail?id=78377
+-keepnames class !android.support.v7.internal.view.menu.**, ** { *; }
+
 -keep public class android.support.v7.widget.** { *; }
 -keep public class android.support.v7.internal.widget.** { *; }
-# below line disabled due to LGE ROM bug.
-# -keep public class android.support.v7.internal.view.menu.** { *; }
 
 -keep public class * extends android.support.v4.view.ActionProvider {
     public <init>(android.content.Context);
-}
+}

proguard-testing.pro

@@ -0,0 +1,10 @@
+-keepattributes Exceptions
+-dontskipnonpubliclibraryclassmembers
+
+-dontwarn android.test.**
+-dontwarn com.android.support.test.**
+-dontwarn sun.reflect.**
+-dontwarn org.assertj.**
+-dontwarn org.hamcrest.**
+-dontwarn org.mockito.**
+-dontwarn com.squareup.**