Merge pull request #1 from IsmaelMT/master

Added create idea API endpoint.
Fix CORS issue that prevented request from angular
Fix errors with custom CORS by using the "rack-cors" gem
Add basic authentication using the "devise" gem
Listing all ideas api endpoint and tests.
List idea with users embedded.
Require authenticated users for the "ideas" controller
Preview
End of sprint 2! :D
Added active admin
Changes made for sprint2
Formatted form for user admin
Merge branch 'topic/preview_version' of https://github.com/emseupm/api into topic/preview_version

Conflicts:
	db/schema.rb
Fixed ideas' tests and factories.