Refactor WebAgg so it's easier to embed in other applications and run
over a server other than tornado.
Make figure larger.  Print address to console.
Let the Javascript side control when to fetch new frames.  draw_idle
sends a "draw" message to the browser.  If the browser is not already
waiting on another frame, it sends a "draw" message back to the server
which then returns an actual frame.  The nice thing about this approach
is that it's completely timerless.
Bug: alpha parameter was ignored when fill color is #000000
Catch stderr as well as stdout
BUG: Fixed github stats retrieval

Currently urllib is used to retrieve a json file from Github, however
Github url used is not static url, urllib2 required to retrieve
information from Github.
implement additional spectrum functions in mlab
implement improved mlab spectrum function tests and tests for additional mlab functions
implement additional spectrum plots in axes/_axes