Checkboxradio: Correctly retrieve label

This moves label-finding code into one function to help render the code
unit-testable. The new code also relies more on native means of getting the
label, which improves performance a great deal when the .labels property is
supported, and also improves performance when such a property is not supported
(such as in FF27).

http://jsperf.com/checkboxradio-label-retrieval-non-nested/5

Closes gh-7293
Fixes gh-7292
Navigation: Do not assume "//" is always part of an absolute URL

Closes gh-6597
Fixes gh-6574
Fixes gh-6599
Listview: Do not compute .first() if there is only one anchor
addFirstLastClasses: .not( ".ui-screen-hidden" ) -> custom function

http://jsperf.com/dot-not-vs-loop

Closes gh-7228
Fixes gh-7227
Table: remove reflow CSS hack for Safari <= 5

It causes problems with assistive technology not being able to detect tables.

This effectively reverts bafa5d95d1ae2f028749c710aa198b96de7eeb3d, thus
removing the fix for gh-5380.

Closes gh-6584
Fixes gh-6583
Re gh-5380
Build: Updated jQuery core
Build: Updated version in Bower JSON file
Theme: Keep background for checkbox-off icon when using no-disc icons

Fixes gh-6993
Closes gh-7451
Theme: Added a comment for the ThemeRoller

Fixes gh-7454
Closes gh-7455
Table: prevent jqmData calls for columns without a priority.

Closes gh-7315
Fixes gh-7357
Helpers: Fixed typo in description

Closes gh-7429
Defaults: Fixed minor typo in comment

Closes gh-7427
Build: Update version from pre to -pre

Ref jquery/jquery-release#61
Closes gh-7328
Slider and Rangeslider: Express module dependency

Both modules have a hard dependency on the "vmouse" module that should
be expressed in AMD.

Re gh-5987
Closes gh-7383
Closes gh-7274
Demos: Allow text selection in INPUTs and TEXTAREAs.

Closes gh-6819
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