Support sort param in API lib
Rename WordCloud to DocSetTokenCounter

This also includes a couple functional changes, like more aggressive
punctuation stripping.
Add Math utils for convergence testing
Client bug fixes

Improve fontStack, remove unused fill variable, rename cloudDrawer to
draw cloud, increase resize throttle, and set up the client to handle
getting the progress from the server and a variable number of data
pushes.
Add convergence testing
Merge pull request #2 from overview/node-backend

Bug Fixes and convergence testing