* TagsController inherits from ApiController
* Let ApiController inherit from ActionController::Base to have its own lifecycle
* Remove unused method
* Use only one respond_to :json for the entire API
* ApiController inherits from ActionController::Base
* Use Pundit only where needed
* Listings creation and update API
- new listings controller
- refactored code to share core functionnality between api and web controllers
- code in common in classified listing concerns
- added tests for index/create/update
- json output as views
- updated a factory
* Listings creation and update API: code update
- refactored json calls
- added test cases
- added pagination for list of listings
- refactored jbuilder files
- typos
* Listings creation and update API: code update
- tags and tag_list in controller
- changed view to display both
- refactored and added test
* Listings creation and update API: code update
- small change to resolve conflit
* Listings creation and update API: code update
- added test case
- deleted unneeded test case
