do not load jquery.js inside mediaelement.js

Do not require jquery.js inside this gem!

This causes big trouble for almost everybody, since they will already do this somewhere else!! So you end up with 2 jquery versions, but have no idea about that fact. Plus the uses loads 2 times jquery.

Plus i changed files to vendor dir, since it is the standard location. And i namespaced rails.js, not sure if that was needed.