(Issue #752) Add user-side /data/interests (JSON), remove site-side /misc/interestdata

Add a JSON API endpoint for retrieving user interests, and remove the old script.

No replacement is being made for the previous ?int= functionality to find the count for a single interest; this was apparently rarely used.

The new file is based on the Edges.pm file, so I've left the credits for that file as I'm not sure how much of the stuff I deleted is theirs. (Commit b879927 shows the exact amount that was deleted.)

Fixes #752.
Rebase on a feature branch is fine. Rebase on master / develop is the only thing that's not 





> On Jul 4, 2014, at 01:45, Sophira <notifications@github.com> wrote:
> 
> In cgi-bin/DW/Controller/Interests.pm:
> 
> > +       my ( $code, $message ) = @_;
> > +       $r->status( $code );
> > +       $format->( $r, { error => $message } );
> > +
> > +       return $r->OK;
> > +    };
> > +
> > +    # Load the account or error
> > +    return $error_out->( $r->NOT_FOUND, 'Need account name as user parameter' ) unless $opts->username;
> > +    my $u = LJ::load_user_or_identity( $opts->username )
> > +        or return $error_out->( $r->NOT_FOUND, "invalid account");
> > +
> > +    # Check for other conditions
> > +    return $error_out->( $r->HTTP_GONE, 'expunged' ) if $u->is_expunged;
> > +    return $error_out->( $r->FORBIDDEN, 'suspended' ) if $u->is_suspended;
> > +    return $error_out->( $r->NOT_FOUND, 'deleted' ) if $u->is_deleted;
> Hmm, question - I can't rebase if I've opened a pull request, can I? Should I merge? That'd mean adding a lot of commits to this branch...
> 
> —
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