Pickle and Unpickle theano functions

Added a test case to verify if pickle and unpickle a compiled theano function works.
Passed.

This is the follow up of gh-1945
pushed!

On Fri, Oct 17, 2014 at 1:36 PM, Frédéric Bastien <notifications@github.com>
wrote:

> In doc/faq.txt:
>
> > @@ -4,7 +4,7 @@
> >  ==========================
> >  Frequently Asked Questions
> >  ==========================
> > -
> > +3B
>
> remove this change.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/Theano/Theano/pull/2139/files#r19031508>.
>