Demos: Correct reference to core in /index.php

Fixes gh-7511
Pagecontainer: make all page events go through triggerWithDeprecated

To make sure all former page events have a page container counterpart,
and that this counterpart has both a toPage and prevPage prop on the ui
object
Also add a demo of how to debug pagecontainer events

Fixes gh-7063
Fixes gh-7283
Fixes gh-7176
Closes gh-7285
Selectmenu: Update demo to no longer rely on deprecated page events

Re https://github.com/jquery/jquery-mobile/pull/7285#issuecomment-43017058
Build: update authors list

(cherry picked from commit 0953cb7011b4a4c59c5de56f6a7097b5bc09a142)

Conflicts:
	AUTHORS.txt
Build: Use a single SHA for all jQuery UI files

Closes gh-7497
Build: Remove hashchange plugin

All supported browsers have a native implementation of hashchange.

Closes gh-7498
Build: Update license

Closes gh-7436
Pagecontainer: Add unit test for load method when no options are passed
Demos: Make casper tests check for JS errors and fail if any are found