Switch to "rake test:prepare" in travis
Add guard-rails
Remove unused styles
More rails 4 stuff
Permit language_skills_attributes parameter
Remove unnecessary quotes
User availabilities, work in progress
Refactor test suite

* Speed it up (forgot to switch to back default driver after :mechanize).
* Reorganize (move some feedback tests to their place).
* Render css when using save_and_open_page.
* Other minor fixes.
Use edge byebug
"I18n." not necessary here
Revert "Add guard-rails", I don't need it

This reverts commit 7beef5c9e9bbcdc3fbed1b95aea7d5b82b3cd9d7.