DO NOT MERGE- Informational only: Tsinghuax/video/player

This is a very violent transplant of xuetangx's video player.What I am done are as follows:
--Because of the GFW ,I cannot get some js file from web when I deploy the platform,so I download them and save them locally.
--Just for a simple demo of our player,I added our js file into project and modify the lms code without considering the framework.

The way to running this demo are as follows:
--In cms, create a video module in a course, fill in the "video source" field with a static url of a mp4 file and leave the other fields  blank.
--In lms(Just in lms), you can see the effect of the demo.

Send me email(jingxyy@qq.com) if any questions.