FLOE-119: another modification to metadata output

Changed the output of the metadata for the video. Moved the contentUrl to a meta tag, and added the meta tag for captions as an accessibilityFeature.
FLOE-131: Improved video metadata panel to not re-render itself at every modelChange.
FLOE-131: Fixed typo.
FLOE-131: Fixed the model binding on the protoTree for signLanguage.
Merge remote-tracking branch 'jobara/FLOE-119'

* jobara/FLOE-119:
  FLOE-119: another modification to metadata output
Merge remote-tracking branch 'cindyli/FLOE-131'

* cindyli/FLOE-131:
  FLOE-131: Fixed the model binding on the protoTree for signLanguage.
  FLOE-131: Fixed typo.
  FLOE-131: Improved video metadata panel to not re-render itself at every modelChange.
FLOE-128: Removed the inline form styling for URL input field in toolbar, and replaced with Bootstrap grid layout. Also adjusted the text for the URL input label.
Merge branch 'master' into FLOE-128