Don't rewrite docstrings to output to the worksheet
Don't rewrite docstrings to output to the worksheet

Exempt docstrings (a literal string as the first statement of a function
definition) from the rewriting that results in reinteract_output() being
called.

http://www.reinteract.org/trac/ticket/81

jbaayen/reinteract,jbaayen/reinteract,johnrizzo1/reinteract,alexey4petrov/reinteract,rschroll/reinteract,rschroll/reinteract,alexey4petrov/reinteract,alexey4petrov/reinteract,johnrizzo1/reinteract,rschroll/reinteract,johnrizzo1/reinteract,jbaayen/reinteract