Add CSV download button to Studio video upload page

@nasthagiri @clrux @BenjiLee 

http://studio.gwprice.m.sandbox.edx.org/videos/vpip/vpip/vpip
I think "full details" isn't the right phrase, because it's actually not the full details. Based on the story (https://openedx.atlassian.net/browse/MA-144), it contains just identifying information for the video and the URLs for various encodings, the intent being to replace the report that is currently generated and sent by the media team.