Bug 1093620 - Using a single root store for Loop rooms. r=Standard8

--HG--
rename : browser/components/loop/content/shared/js/localRoomStore.js => browser/components/loop/content/shared/js/activeRoomStore.js
rename : browser/components/loop/content/shared/js/roomListStore.js => browser/components/loop/content/shared/js/roomStore.js
rename : browser/components/loop/test/shared/localRoomStore_test.js => browser/components/loop/test/shared/activeRoomStore_test.js
rename : browser/components/loop/test/shared/roomListStore_test.js => browser/components/loop/test/shared/roomStore_test.js
Bug 1093475 When a Loop call URL is deleted/blocked, use the proper session. r=mikedeboer