update gradle plugin
Merge pull request #5 from nohana/feature/updateGradlePlugin

update gradle plugin
Update README.md
fix travis script
Merge pull request #6 from nohana/feature/updateGradlePlugin

fix travis script
Update README.md
Merge branch 'master' of github.com:nohana/Caladbolg into feature/upgradeSampleApp

Conflicts:
	gradle/wrapper/gradle-wrapper.properties