Add methods for changing user roles to index and User.class controller
Delete useless comments, debug messages, add spaces for '=', refactor changeLevel to changeRole and refactor /user/change to /user/role/change
Prettify the code, change level to role and post to put
Add forbidden access check to User.class controller
Make the admin check in user controller indirectly through method,

add TODO comment for changeRole route
Merge pull request #9 from onurv12/master

Add methods for changing user roles to index and User.class controller