Refactoring the settings module
Merge pull request #38 from jespino/refactor-settings-module

Refactoring the settings module
Fix YT video removal in assets nuggets
Updated admin-sortables version to 1.4.9 and added zipimportx to dependencies
Merge branch 'master' of git://github.com/OpenMOOC/moocng
Merge branch 'master' into mongo_refacts

Conflicts:
	moocng/settings/common.py