Corrected missing polyfill resources -
* Excanvas and selectorvizr was missing from polyfill directory. Since yepnope has a 10000 millisecond resource timeout, this created a 20000 millisecond lag for all other tests and in Modernizr
* Corrects the lag notice by @pjackson in PR #2978
Merge pull request #2980 from masterbee/hotfix--missingpolyfils

Corrected missing polyfill resources -
Jaws polyfill: Added polyfill to fix the Jaws sectioning elements/heading level incrementation bug and the sectioning element/heading association bug.
Merge pull request #2978 from pjackson28/jawsariapolyfill

Jaws polyfill: Added polyfill to fix the Jaws sectioning elements/heading level incrementation bug and the sectioning element/heading association bug.
Jaws aria polyfill: jQuery style guide fixes
Merge pull request #2981 from patheard/jawsariafixes-jquery-style

Jaws aria polyfill: jQuery style guide fixes
Added 3 new helpers additions to data-ajax functionality
* data-ajax-append : appends the URL contents to the element
* data-ajax-before : put the URL contents before the element
* data-ajax-after : puts the URL contents after the element

Optimizations:
* removed the data-fetch into it's own event to allow for uniqID generation of ajaxed content to prevent collisions
* function now available to all elements that require ajax-fetching
* added a misc glod in the coffeescript to bring over .txt files. This could be improved but is required for ajax files
Merge pull request #2984 from masterbee/plugin-data-ajax

Added 3 new helpers additions to data-ajax functionality
Added $(':tabable') expression helper to assist with keyboard navigation targetting
Jaws ARIA polyfill: Added support for nested heading elements
Merge pull request #2989 from pjackson28/tweakjawspolyfill

Jaws ARIA polyfill: Added support for nested heading elements
Renamed megamenu plugin to something more generic
* Added sample and refined navigation model to better align with ARIA proposed
* Introduced a new sectional based navigation structure that leverage HTML5 a bit more with in page anchoring a navigational aids
* Still a bit buggy in fringe cases of mouseleave events, but exploring the issue
Merge pull request #2990 from masterbee/plugin-menu

Plugin menu
Tweaked menu.coffee to include better comments
Merge pull request #2993 from masterbee/plugin-menu

Tweaked menu.coffee to include better comments
Toggle: generic expand/collapse all plugin

This generic version of the plugin is able to toggle elements between
the "on" and "off" states.
Merge pull request #2994 from patheard/toggle

Toggle: generic expand/collapse all plugin
data-picture: wrapper plugin for @scottjehl's Picturefill

Uses media queries to dynamically load different image sources.
Merge pull request #2998 from patheard/data-picture

data-picture: wrapper plugin for @scottjehl's Picturefill
Build: Excanvas to Bower dependency

Remove checked in copy of Excanvas with bower install.
Minor task cleanup for bower.