Merge branch 'release/Release_1.1' into develop
Update version to next snapshot version number 1.1.1-SNAPSHOT
Update .gitignore
Add Gradle wrapper
Do not use + in version names
Fix Gradle dependencies
Fix Google Play services integration
Update README.md
Update targetSdk to 20
Update support-v4 to 20.0.0
Update Gradle plugin identifiers
Enable Travis CI build