Tabs: Fixed typos on the demo page

Fixes gh-7459
Closes gh-7460
Listview: Make it possible to apply count theme with a class

Fixes gh-6966
Closes gh-7457
Theme: Prevent text underline in visited link buttons

Fixes gh-6926
Closes gh-7447
Core: Width auto for inline button elements in toolbars

Fixes gh-7232
Closes gh-7446
Checkboxradio: When pre-rendered, assume label is a sibling of the input

Closes gh-7471
Fixes gh-7470
Table: Copy entire contents of reflow headers into reflow bold tags

Closes gh-7437
Fixes gh-7415
Selectmenu: Delay trigger until after the list closes

Closes gh-7197
Fixes gh-7076
Toolbar: Back button correctly appears/disappears on external toolbar

This commit makes the following modifications:
1. Rename _addBackButton() to _updateBackButton() and move the decision making
   as to whether to add or remove a back button from _setOptions() into
   _updateBackButton().

2. Call _updateBackButton() from refresh() as well. This will cause the back
   button to be updated whenever the page changes, because the "pageshow"
   handler is hooked up to refresh().

3. Modify _addHeaderButtonClasses to not recognize the back button as a left
   button.

4. Modify the preconditions for adding a button to include an alternative to
   checking the page's URL for instances where there is no page present - i.e.
   when the toolbar is external. In such cases one must add a back button if
   the active item on the history stack is not the first item.

Closes gh-7188
Fixes gh-6950
Transitions: Correct exception in unit tests

Fixes gh-7458
Flipswitch: Clean up integration tests page

Fixes gh-7443
Build: Update source location for jquery.js

Fixes gh-7479
Init: Correctly assign data-url for initial page
Init: Make sure "data-url" attribute for initial page is decoded
Pagecontainer: Escape dataUrl when trying to find page based on it

Fixes gh-1383
Pagecontainer: Test behavior of _find() in the face of weird URLs
Pagecontainer: Remove code dealing with subPageUrlKey special case
Path: Remove code dealing with subPageUrlKey
Path: No longer test for correct stripping of subPageUrlKey
Init: decodeURIComponent() replaces $.mobile.path.convertUrlToDataUrl()
Pagecontainer: Decode URI when assigning to "data-url" during _parse()