implemented sjmpc.py
started API documentation / documented SJMP
implemented Collection, added Object, enhanced message log
costumized Event.__str__ (server)
implemented handling of collection messages (client); added collectionId to post, postNew, DoPostHandlers; added DoPostScreen; updated RemoteUrlPostElement
merged websocket-api.md into api.md
Merge branch 'sjmpc.py' into collection
fixed: inconsistent order of message handlers
documented current API calls / events
implemented GridPost; extended WallApp.get_collection for posts
added page / frame class to html element in templates; reset background of display post frame
implemented GridPostElement; added post ID to PostElement's frame URL (display)
fixed: illegal use of Post.create in tests
Merge branch 'grid-post' into post-menu

Conflicts:
	wall/res/static/remote.js
enabled cleanup of collection posts in PostScreen