Sorted, streaked data usage

A new, similar format but with dates sorted and values streaked:

    {'date4':2,'date1':1,'date2':1,'date3':1} -> {'date1':1,'date3':1,'date4':2}

http://kannatusilmoitukset.fi/initiatives-sorted-streaked.json

This gives us a gzipped download size of ~half of the original, and reduces js workload.

(Obviously there are a lot of further optimization possibilities too)