Extraneous backslashes in latexpdf ipython output

[ajgpitch]

There are a lot of backslashes in the place of where [OUT] would expected to be seen in the ipython generated latex.
For example:

\PYG{g+go}{\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}\PYGZbs{}

(this actually goes on much longer, I just copied a fraction of it)

Does not appear in the HTML output

[jakelishman]

Fixed by #120