re: #191 - Picture pipe video support in the carousel/lightbox

* made the vimeo support generic by using the edmIsShownBy value
** commented out the oembed logic, no longer necessary, but want to keep it in the code, for the moment, in case we need to handle it separately - would be the case if not all oembed content contain edmIsShownBy
* hard-coded lightbox dimensions for Reelport/Picturepipe videos coming from EFG
* added support, using mediaelement.js, for .flv and .mp4 videos
* added html comments in <li> of the record image that indicate the edmDataProvider and oembed when that is the case