Move files to correct Gradle directory and add Android Studio files.
Update readme with info about the "Google Repository" add-on.
Merge pull request #11 from PhillyOpen/gradle-integration

Android Studio integration (fixes #10).
Update gradle wrapper version and plugin version to work with newer versions of Android Studio.
Merge pull request #12 from PhillyOpen/gradle-integration

Fix build issues with newest version of Android Studio
flatten directory structure
ignore .gradle directory