Fixed a little bug, now server responds 404 instead 500 when
you try to download an inexistent resource.
Added naive Users system

Added abortIfNotExists method and user resource

Added users resource on API

Added a model to prevent fake/spam users.

-Changed the user-creation method, now needs 2 steps to complete.
-Added url /createUser to activate users using a key.
-Added a method which generates random codes

Added passwords

Fixed wrong spelling

Removed white-lines and solved user-creation conflicts.

updated README.rst