Adding a Set of New Unit Tests (firebase#96)

* Added jacoco plugin and parser

* Coverage reporter impl

* More unit tests and cleaning up dead code

* More tests for RTDB

* More database tests

* Some unit tests for Repo

* More tests for Repo

* Cleaning up mocks

* debug info

* More debug info

* Updated repo test

* Cleaned up test code

* Removed some code changes

* More repo tests

* Removed duplicate code block

Author: hiranya911

src/main/java/com/google/firebase/database/utilities/tuple/NameAndPriority.java

@@ -96,9 +96,9 @@ public boolean isUsingBackgroundThreads() {
     // Create a no-op thread to force initialize the ThreadFactory implementation.
     // Start the resulting thread, since GAE code seems to expect that.
     initThreadFactory(new Runnable() {
-          @Override
-          public void run() {}
-        }).start();
+      @Override
+      public void run() {}
+    }).start();
     return threadFactory.get().isUsingBackgroundThreads();
   }