Issue #3238136: Append hash parameter for unlisted Vimeo videos (3.1.0 reroll)

Ethan Teaguerequested to merge
issue/video_embed_field-3238136:3238136-vimeo-hash-reroll-3.1.0 into 3.x

Re-roll of bkosborne's #3238136 fix against the 3.1.0 release line. Adds getHash() and passes the hash through to Vimeo's iframe so unlisted videos play. Targets 3.0.x because that's the line 3.1.0 was tagged from.

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