HCSVLAB-724:  Added share/unshare behaviour to item lists.
Merge branch 'master' of https://github.com/IntersectAustralia/hcsvlab

Conflicts:
	db/schema.rb
HCSVLAB-724:  Added the rest of the behaviour for sharing and stop sharing an item list.
Merge branch 'master' of https://github.com/IntersectAustralia/hcsvlab