Add jquery and strip non essentials.

This will make skinning easier.
Increase height of player controls.
Merge changes in master.
Can't empty body or youtube stops working.
Fix problem with navigating to related links.
The after selector is not needed for now.
Add toggle() function to document which can turn extension on and off.
Use chrome.storage and add checkbox to popup.html.
Merge pull request #7 from danielstockton/jquery

Add jquery and strip non essentials.