Merge pull request #39 from Geodan/master

merge group stuff by tom into the item branch
renamed featureStore to itemStore

Initial version with the new naming convention; itemStore in stead of
featureStore and items() in stead of features()

Does work, but doesn't do feature sharing yet
renamed everything to item
item.permissions added
added status and data functions

and a bunch of read only ones
Merge remote-tracking branch 'origin/item'

Conflicts:
	demo/index.html
	src/cow.core.js
	src/cow.itemstore.js
	src/cow.localdbase.js
	src/cow.websocket.js