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.
Hide the volume bar by setting its content's width to zero.
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
@doublex fixed an issue with IE7 backwards compatibility. closes #1542
@mmcc made it possible to override the font-size of captions and subtitles. closes #1547
@philipgiuliani added an Italian translation. closes #1550
@twentyrogersc fixed the return value when setting the poster source. closes #1552
@heff updated to swf v4.5.0 to fix event issues. closes #1554
Merge branch 'review-rpless-feature/accessible-volume-menu'
Added a line to the changelog for #1519. closes #1519