Fixed issues from comments on d7f840a9693a73a4764eba2d5c7c0cb4b7120c80

- use triple equals
- don't block play call on error
Added a missing changelog item
Modernized the fullscreen API and added support for IE11. fixes #1155 closes #1205
Added contrib feature accept and review commands
Added cross-browser testing with SauceLabs, and added Karma as the default test runner. closes #1187