ignore .gradle
Merge remote-tracking branch 'origin/master' into develop

Conflicts:
	.gitignore
Add travis badge
Change deprecated symbol in build.gradle
Wipe out compiler warnings
Merge pull request #17 from JyunjiKondo/master

Some fixes
Removed track(AARRR) methods, Added trackSys()

Event names are validated for track()/trackSys().
Updated version and libraries
Merge branch 'feature/mod' into develop
Implemented UsageTimer
Removed unused <uses-sdk />

Settings in build.gradle is used instead
bumped version
Merge branch 'release/1.1.0'