Updated to-do
Upgraded Firefox 30 --> 31
Got drawing area arrow to snug up to top of drawing area
Starting work on styling the 'clear' button
Fixed smoke test failure caused by renaming clear button ID
Moved 'clear' button to top right of drawing area
Updated to-do
Styled and tested footer
Positioned 'join us' button
Upgraded Node 0.10.26 --> 0.10.30
Converted 'join us' link from inline link to standalone block
Styled 'join us' link colors and height
Factored out getBoundingBox() in CSS test code
Trying to get centering logic to work cross-browser w/o rounding issues