Restructure the way settings are stored so that we can reload them in-memory when they are changed.
Add ability to change Screenly settings via the /settings page. Closes #47
Merge branch 'screenly-ui' of github.com:wireload/screenly-ose into screenly-ui
Merge branch 'screenly-ui' of github.com:wireload/screenly-ose into screenly-ui

Conflicts:
	server.py
Merge branch 'screenly-ui' of github.com:wireload/screenly-ose into screenly-ui