Map loads in under two minutes, fixes #99

It's not perfect in terms of speed but it's much, much quicker.
Fix bug: every region was black, there was no legend

... and all regions were displaying unknown percentages
Use $http instead of $.ajax
Use CDN for topojson
Cache http response
No longer displays wards on page load

* Fix issue where zoom to region stopped working
* InvalidateSize is not working
Single definition of numToUnpack for feature coordinates

... when converting to LatLng
Invalidate map size in initMap with 2sec timeout

Should find a better solution than this "magic number" for timeout.
Merge pull request #100 from taarifa/topojson

Fixes #99. Map loads in under two minutes. It's not perfect in terms of speed but it's much, much quicker.