Done some tasks.
Install ransack gem.
Add performer field to Task.
Add search engine to tasks/index.html.haml
Remove api from users_controller.
Merge branch 'feature/search' into develop

* feature/search:
  Remove api from users_controller.
  Add search engine to tasks/index.html.haml
  Add performer field to Task.
  Install ransack gem.
  Done some tasks.