Add loading bar and spinner to full image viewer.
Add placeholder image for GridView.
Implements ProgressBar in ActionBar while loading GridView.
Cleanup.
Update build.gradle to use Gradle version 0.5 and higher.
Update files for Android Studio 2.1.
Update files for Android Studio 2.1.
Update files for Android Studio 2.1.
Update files for Merge.
Merge branch 'master' into redo-loading-and-paging
Update files for Merge.