Use #underscore, not #downcase for help text scope
Support both #downcase and #underscore for help text's I18n scope
Refactor #generate_help_text
Merge pull request #140 from atipugin/master

Use #underscore, not #downcase for help text scope
Update README.md

Improve help text i18n documentation
Update CHANGELOG.md

Add #140 changes to features list
Try to use localized attribute name for label errors