Electrum client

RFCR @jsutterfield & @garthwebb 

Adds Electrum php client and updates Special:Videos page to use Electrum
Relates to https://github.com/Wikia/electrum/pull/2
I left a comment on the Electrum portion of this PR about potentially taking off the /images portion when sending this image path. See here: https://github.com/Wikia/electrum/pull/2/files#r16365257