Fix error with Heroku toolbelt ruby version

-  Fix: Your Ruby version is 1.9.3, but your Gemfile specified 2.1.1
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Cucumber features
Checkbox implementation pretty much ready
Admin steps passing
Listing steps passing
Possible to remove all checkbox selections
Tests passing, refactoring needed
Render only 1 option for Checkboxes
Required
Search bug
Remove duplicated code
Some refactoring
Move grip margin-bottom from col to row
Amenities in columns
New listing checkbox group
Dropdown options -> options
Translations
Fix Number field tests [skip ci]
Fix checkbox group test