Added requirements file.
Removed Composer and Arranger from admin.
REST interface for Artists.
Added Container model to merge various Cabinet etc models.
Removed old Cabinet etc models.
Angular demos
Merge git://10.20.1.104/~rstewart/projects/symphony into feature/1.5_upgrade
All working together in hackfest. Basic AngularJS working.
Merge branch 'feature/1.5_upgrade' into develop
Merge branch 'develop' of github.com:cellofellow/symphony into develop

Conflicts:
	library/serializers.py
	library/urls.py