Adding wtforms to requires.

Since wtforms is used, it should be in requires.
* Sharoon Thomas: " Re: [nereid] Adding wtforms to requires. (#226)" (Fri, 31
  Oct 2014 04:38:13 -0700):

> > @@ -125,6 +125,7 @@ def run(self):
> >      'speaklater',
> >      'Flask-Babel>=0.9',
> >      'Flask-Login',
> > +    'wtforms',
> 
> `flask-wtf` in line 122 already depends on wtforms ?

True, but as long as I would use a package, I would include it in requires (you
can't always be sure, that another package won't remove a requires). 

-- 

    Mathias Behrle
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