Fix #327. Update map.csv

Avoid duplicate records by checking for recipient,transaction_id which should be unique.
Unrelated: latest map.csv data.
Might be better, but I think the trans_id is almost unique,

> On Oct 9, 2014, at 9:43 PM, Tom Dooner <notifications@github.com> wrote:
> 
> In backend/schema.rb:
> 
> > @@ -43,6 +44,7 @@
> >  
> >      t.index :recipient_id
> >      t.index :contributor_id
> > +    t.index :transaction_id
> It'd be better if we made a compound index:
> 
> t.index [:recipient_id, :transaction_id]
> —
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