Updated multi_json gem
Fixed a bug on show.rabl

This file was was calling a RABL template to DRY things. A bug was
detected when using the template call, so we have deleted the call.
Updated Capybara version
Improved test coverage.

Mainly feature specs. A Login Macro has been created to be
used by feature tests that need a logged user.
Merge branch 'master' of https://github.com/MarsBased/cookinme