Bugs with youtube's redesign

[ngzhian]

This issue tracks bugs as result of redesign (web components/polymer)

• QuickView's styles are off
• Hover doesn't work on video page

[ngzhian]

In 2.4.0 i fixed it to work with YT's redesign, however the code is super kludgey since i wanted to get a release out that works. i should rework things a bit, in particular factor out the rendering code so I can stub in fake YT responses to test layout without hitting YT api.

[ngzhian]

And maybe move the extension to use shadow dom to eliminate style clashes.