Extension icons
Add 19x19 and 128x128 icons
Rename the 48x48 icon
Add new images to manifest.
Improve design and functionality of the options page
Add tabbed navigation - currently "options" and "about";
Add notification message on options save;
Add 48x48 icon as logo.
The "about" and "options" links are swapped and lead to their respective tabs on the options page.
Respect 80 characters maximum width.