Remove params from list.
Tweaking automatic screenshots in acceptance tests.
Merge pull request #3277 from edx/oleg/custom-params-fix

Do not allow user overwrite some LTI parameters using custom parameters field. BLD-989.
Merge pull request #3273 from edx/valera/hendrixx

Tweaking automatic screenshots in acceptance tests.
HD control is hidden initially. On first play of video, when
player.getAvailableQualityLevels returns a non-empty array, it will eventually display, if HD qualities are available (highres, hd1080, hd720). [BLD-937]