Adds tag instead

- Cleans core app by removing useless files
- Organizes utils in a utils directory
- Creates a digg-like pagination class
http://blog.localkinegrinds.com/2007/09/06/digg-style-pagination-in-
django
- Adds constance to installed app to manage settings in django admin
console
- Adds debug_toolbar and django_extensions in dev mode

- Move static files from core app to root
- Uses bower to manage front-end 3rd parties libs
- Uses gulp to build front-end