Merge branch 'release-0.2.1' into develop
Merge branch 'fix-0.2.2' into develop
bundle for develop branch
Add gem version badge
Improve documentation
Merge branch 'improve-readme' into develop
Update description in gemspec
Update dependencies
Remove support of ruby 1.9.2
Improve README
Bump version 0.2.3
Merge branch 'release-v0.2.3'

Conflicts:
	Gemfile.lock