Comments and style in the CoffeeScripts
Filter regions by selected country with JS

This allows a graceful degradation for non JS users through a grouped
select menu.
Move comment
Use https://github.com/plataformatec/devise/pull/3320
Only preset default language when locale available
Use Madrid as the default place
Add some validations to LanguageSkill model
Fix N+1 query problem again
Try to fix travis build by not loading seeds