This allows using browser back and forward buttons
once users have started heading between revisions.
This also updates the URL so that the page can be
reloaded at any time and the same state will be held.
(This also removes a commented out block of code that
I think was left for updating the URL)
Change-Id: I4cfe38f76eeb9e090f0a8a42e22e75cf84014d60
* threw out most of the things from init.js
* turned Slider + View into respective modules
* pointers should remember position (except on page load) and correctly
slide back to their position/to the side
Some things still need testing and refactoring.
Addshore: - CS fixes and comment out current failing tests
Bug: T134395
Change-Id: I78a7095e1d9902314163b1443448f47ef0484d4e
