[#67] Add API support in users controller.
[#72] Add destroy action for users, with link from profile page. Remove index action.
[#67] Connect API in user destroy action.
[#72] Use session.delete(:token) to destroy session.
[#72] Add update action for user
Merge branch 'user-api' of github.com:gotar/Internship-calendar-UI into user-api
[#72] Fix typos and indentation
[#72] Fix user sign-out.

Deleting :user_token destroys session.
[#67] Clean-up.

- Fix redirection on sign-up.
- Store API response in `response` variable.
Merge pull request #36 from gotar/user-api

[#67] Connect user controller to API