Updated version of expanded canvas overlay

This is a refinement to the expanded state of the footer displayed below a Processing sketch created with Studio Sketchpad ( http://sketchpad.cc ), visible when the mouse hovers over the footer. The default state is visible here: http://drbl.in/69665

This rebound reflects two refinements over the original shot:
* The footer now includes "share" links for Twitter and Facebook.
* The top row of links are now all verbs.

More about these canvas footers on the Studio Sketchpad blog: http://blog.sketchpad.cc/2010/10/fancy-footerwork/