updates for Rails 4

* REMOVE: cucumber in favor of rspec request specs
* REMOVE: no more binstubs
* UPDATE: markup for foundation 4
* ADD: convenience scripts (bootstrap, data)
* ADD: time formats to locales
* UPDATE: use Sentry instead of Airbrake
* UPDATE: don't ignore /bin
* UPDATE: use puma instead thin
gaslight updates
updates for Ruby 2
bump version