fix disappearing map when switching locales

Some js libraries are not turbolinks ready. As a conclusion after switching
page some elements crash. In our case map disappeared and tooltips stopped
to work. It is solved by jquery-turbolinks gem.
Merge pull request #24 from Nuanda/fix/disappearing-map

fix disappearing map when switching locales
devise with facebook login
google oauth2 login
better colors for fb and g+ buttons
back to root_path after omniauth login failure

`database_authenticatable` was removed from the user. As a conclusion
paths to login page are not added into routes. This has one drawback:
logout path need to be defined manually inside `routes.rb`.
login specs