Add support to more two video sources: Wistia and Samba Videos

Samba Tech (http://www.sambatech.com) is a online video platform pioneer in Latin America used by media groups, enterprises and universities.

Wistia (http://www.wistia.com) provides a video hosting application that makes it easy to manage, share, and track video at work.

This pull-request adds support to these two video sources.