Fix datepicker

This at least makes it possible to test :)
We don't have a consistent position on whether config options default to on or off. I think off probably makes more sense for this one though, will change back.

> On Oct 13, 2014, at 3:17 PM, Victoria Earl <notifications@github.com> wrote:
> 
> In uber/configspec.ini:
> 
> > @@ -122,7 +122,7 @@ custom_badges_really_ordered = boolean(default=False)
> >  # is turned on, then all registration forms will display and collect the exact
> >  # birthdate. Turning this off will simply display a drop-down selection of the age
> >  # groups defined below.
> > -collect_exact_birthdate = boolean(default=False)
> > +collect_exact_birthdate = boolean(default=True)
> ...Although it's basically fine right now, since you're merging into ac-staging.
> 
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