Add wistia support to django-embed-video#1

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DamianK-zz wants to merge 2 commits intocommoncode:masterfrom

DamianK-zz:master

Commits on Aug 3, 2016

adds wistia backened class and some tests
bmoe872
committed

Commits on Aug 16, 2016

quickfix to wistia embed
bmoe872
committed