Add sentencize method
Update README and gemspec
Fix bug valid keys
DRY code
Add images support
Add specs for allowed keys
Update coveralls settings
Add connectors specs
Merge branch 'feature/rspec' into develop
Bump to 0.2.0
Add new structure and sentencize_image helper
Refactor specs and update README
Merge branch 'feature/helper' into develop
Bump to 0.3.0
Merge branch 'release/0.3.0'