Merge pull request #13 from pLucky-Inc/develop

Merge develop to master
Update gradle version
Add .gradle/ to .gitignore
Fix testPackageName
Merge pull request #14 from JyunjiKondo/master

Some fixes
Fix pre build fail under Travis CI
Merge pull request #16 from JyunjiKondo/master

Fix pre build fail under Travis CI
Merge remote-tracking branch 'origin/master' into develop

Conflicts:
	.gitignore