Updating README file to explaing how to install and use django-favit app.
Merge pull request #16 from matagus/readme-update

Updating README file to explaing how to install and use django-favit app
Bugfix: cast obj_id to int when getting object from request
Fix FavoriteManager.create method
Merge pull request #17 from mrezk/master

Fix bugs on FavoriteManager and views.py