added background_color to localStorage and added jQuery function to change the value
Update common.js

Added loading the background color from localStorage if it exists on page initialize so it's called by options and new tab page when they load
Update options.html

Added option to set Background Color
Update options.css

Fixed a typo (I think) of unknown inner-block CSS property to inline-block
Better Thumbnails by default for now until It's replaced completely
Merges #3 - Added option to change background color

Tidied up code styling and specified a default background colour.