Revert "Close GH-630: prevent default action for simple html5 media events. fixes #573, fixes #620 (duplicate bug)."

This reverts commit 15544c3d05988cda490ab491d9d68045f1468624.
Merge branch 'stable' of github.com:videojs/video.js
flash seeking, vertical sliders, volume-menu-button
remove bad code
Merge branch 'master' of github.com:brianpkelley/video.js