replace simplejson with json; remove unused imports
fix url
Adds variants to Property; removes display_no_results from Property.

Conflicts:
	lfs/catalog/views.py
	lfs/core/management/commands/lfs_migrate.py
	lfs/manage/product/variants.py
	lfs/static/js/lfs.manage.js
	lfs/templates/manage/product/variants.html
Updates doc.
Merge branch 'master' of github.com:diefenbach/django-lfs
added default email (user.email) value for adressess
Merge remote-tracking branch 'upstream/master'
Merge pull request #149 from restless/master

added default email (user.email) value for adressess
Fixes variant managment; makes all tests pass.
Adds schema and data migration for Property field 'variants'.