cStringIO vs Unicode

[kern3020]

The Figure class uses cStringIO.StringIO(). This limits the html and js output to ASCII. Using StringIO.StringIO() would allow use of Unicode. Should Figure be converted to allow for unicode.

-jk

For easy of reference, here (http://docs.python.org/2/library/stringio.html) is the link to python docs.

[kern3020]

With pull request for #57, I took the liberty of switching to StringIO.StringIO.