Fix incorrectly named navbar tag
Update to latest awesome_nested_set release candidate

The stable versions are not compatible with Rails 4.1.x
No need to explictly specify version for thread_safe gem anymore
Update some dependencies
Don't check for show permission, it's handled by #accessible_by
Update dependencies
Remove cucumber in favour of rspec feature specs with capybara
Fix some missing twiddle wakkas
Use Ruby 2.1.2
Update depenencies
Don't use simple_form from github anymore :D
Upgrade to rails 4.1.5