Store data about whether user is <13 [closes #10]

This adds `under13` to the earner model and allows the POST /user route to recognize it as a valid field.
yeah, agreed on removing the default false.


On Fri, Jun 13, 2014 at 10:25 AM, Brian J Brennan <notifications@github.com>
wrote:

> In routes/earners.js:
>
> > @@ -30,7 +30,7 @@ module.exports = function earnerRoutes(server) {
> >
> >      const putRow = function (row) { return EarnerData.put(row) }
> >
> > -    Earners.put({id: id})
> > +    Earners.put({id: id, under13: under13 })
>
> In fact I should probably remove that BOOLEAN DEFAULT FALSE part because
> in the migration that will make it seem like all the users currently in the
> db are above 13 when actually we don't have information either way.
>
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