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

This reverts commit 15544c3d05988cda490ab491d9d68045f1468624.
Fixed the custom fallback message test which would break when ie8 capitalized tag names
Fixed the getAttributes test in ie8, which reports all attrs, whether or not they were set
Fixed IE8 tests and flaky fonts
Bump version to 4.2.0
Rotating CHANGELOG
Fixed changelog version
Merge branch 'stable' of github.com:videojs/video.js into stable
Added back in reverted #630
Removed sourcemap from compiled output. fixes #712
Close GH-727: Fixed windowLoaded not setting on async script load. Fixes #727
Adding line to CHANGELOG
Rotating CHANGELOG
Bump version to 4.2.1
Merge branch 'stable'
Merge remote-tracking branch 'upstream/master' into feature/unmute-on-mousemove

* upstream/master:
  Bump version to 4.2.1
  Rotating CHANGELOG
  Adding line to CHANGELOG
  Close GH-727: Fixed windowLoaded not setting on async script load. Fixes #727
  Removed sourcemap from compiled output. fixes #712
  Added back in reverted #630
  Fixed changelog version
  Rotating CHANGELOG
  Bump version to 4.2.0
  Fixed IE8 tests and flaky fonts
  Fixed the getAttributes test in ie8, which reports all attrs, whether or not they were set
  Fixed the custom fallback message test which would break when ie8 capitalized tag names
  Revert "Close GH-630: prevent default action for simple html5 media events. fixes #573, fixes #620 (duplicate bug)."