Concept Page Locking

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GREY Soft Locking module provides concurrent editing capabilities. GREY

Page locking alerts you if someone else is already editing a page you wish to edit.
See MGNLSLOCK-1@jira (was formerly MAGNOLIA-88@jira)

We should not use jcr locking but a soft locks
We could to use the preview button to toggle locking or unlocking
The pages are always opened in preview mode and pressing the edit button toggles to edit mode (lock).
The page polls then (by using ajax requests) and as soon no request reaches the server the the page is unlocked (no user action)
If a page is locked you still see the edit button but with a warning. If a user wants to he can none the less enter the edit mode.

A) lock only if you open a dialog

user A edits page x
user B edits page x
- user B gets a warning about A editing the same page
- does user A get a warning about B editing the same page?

user A is done with editing and saves page x
- does user B gets a warning about A having savd the page?

user A clicks on preview
- does user B gets a message about A releasing the lock?

Should this feature be a separate module or be integrated in core magnolia?
for polling the server do we want to use
- an existing lib such as http://github.com/RobertFischer/JQuery-PeriodicalUpdater/ ?
- if so, what about deps on a js framework such as jQuery?
- cook up something ourselves, e.g. http://ajaxpatterns.org/Periodic_Refresh ?