Changed the MenuItem and the Volume Control bar to gain focus when using tab navigation.
Previously, they could not be navigated to via the keyboard.
Fixs #1517.
Tested via manaul cross-browser tests using keyboard navigation (chrome, firefox, safari, and IE 11 ).
reverted the submenu behavior. it now needs to activated before it menuitems become tab targets. The volume control bar now uses the vjs-lock-showing class instead of new class.
@gkatsev fixed isFullscreen reporting on iOS devices. closes #1511

Squashed commit of the following:

commit 02fe7a40d0958e2ed84a6a0cf2be43bec259c72c
Author: Gary Katsevman <git@gkatsev.com>
Date:   Tue Sep 23 14:15:08 2014 -0400

    Feature detect old fullscreen instead of UA switch

commit f3eccbbe678c163021d790c69c3ab365e0a1fe1a
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 22 21:31:34 2014 -0400

    No need for if since assume we're in fs

commit 0498b100843e0aa858b166d02a467e4471c126ab
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 22 21:28:10 2014 -0400

    Revert "Don't trigget vjs's fullscreenchange event"

    This reverts commit cc45177ee5fa950e665e066d170b137aaeb6e398.

    Conflicts:
    	src/js/media/html5.js

commit 1ed30853efb2ea043da4f18b4fdf75da15f55e88
Author: Gary Katsevman <git@gkatsev.com>
Date:   Wed Sep 17 12:00:29 2014 -0400

    Listen via 'this.one'.
    Don't bother checking whether the video element is fullscreen but just
    assume we are fullscreen.

commit 27e27075083d2ad408b5d47055881b2554f59154
Author: Gary Katsevman <git@gkatsev.com>
Date:   Tue Sep 16 18:12:36 2014 -0400

    Use one for event binding.

commit cc45177ee5fa950e665e066d170b137aaeb6e398
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 15 17:28:46 2014 -0400

    Don't trigget vjs's fullscreenchange event
    This event isn't really being used for this usecase right now, so, no
    need to trigger it.

commit ad505a680785d638289657aec4edad60879e945a
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 15 16:45:48 2014 -0400

    Update exports for request & cancel fullscreen

commit e423635b6c8ad58a1ba04e1534a51c075e08b73a
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 15 16:15:10 2014 -0400

    On iOS, use ios specific enterFullscreen methods.

commit fe4a8fbf6ad73b6bc8f57d16c44f0ca4d3bf9450
Author: Gary Katsevman <git@gkatsev.com>
Date:   Mon Sep 15 14:53:20 2014 -0400

    Export isFullScreen correctly. Export isFullscreen as well.
Release 4.8.4
Merge branch 'stable'

Conflicts:
	dist/video-js/video-js.css
	dist/video-js/video-js.min.css
	dist/video-js/video.dev.js
	dist/video-js/video.js
Hide the volume bar by setting its content's width to zero.
Updated to the latest version of the swf to fix HLS playback. closes #1538
Release 4.8.5
Merge branch 'stable'

Conflicts:
	dist/video-js/video-js.css
	dist/video-js/video-js.min.css
	dist/video-js/video-js.swf
	dist/video-js/video.js
@baloneysandwiches added a hasClass method. closes #1464
@mynameisstephen fixed an issue where slider event listeners were not cleaned up. closes #1475
@alexrqs cleaned up the Spanish translation. closes #1494
@t2y added a Japanese translation. closes #1497
@chikathreesix fixed an issue where data-setup options could be missed. closes #1514
Fixed a spelling error in the player docs. closes #1528
@seniorflexdeveloper added new translations and translation updates. closes #1530
Reorganized the volume menu button styles and removed some duplicate definitions
Export videojs.Flash.embed
Exported the videojs.Flash.version method for use in external techs
Added a line to the changelog for #1533