Rendering of Django templates fails in Ironwood after a video_xblock is rendered

[matthewf-ucsd]

We have two significant pages that are rendered using django templates in our Ironwood environment, the logout page and the 'reset your password' reminder email. After a request for a page that includes a video-xblock from the ironwood-rg branch has been responded to, the responding process no longer renders other django templates correctly, because utils.py:render_template() modifies engine.dirs with the path to its own templates.

[GlugovGrGlib]

Thanks for reporting, fixed with #410