Wards and polling centers for Delhi setup

There are 11763 polling booths in Delhi. There are 70 ACs and 272
wards.

The number of polling centers detected comes out to be 2741. That is an
average of about 4.3 booths per polling center!

2 ACs do not fall under MCD and hence do not have any wards - these
include AC038 (Delhi Cantt) and AC040 (New Delhi). The polling center
of these ACs have been tagged directly under the AC without any wards.

Further, there are about 102 polling centers that contain booths from 2
different wards. For now, two different polling centers have been
created for these - each one falling under the respective ward.
Merge pull request #2 from anandjanki/delhi-data-updates

Wards and polling centers for Delhi setup