make map a bit bigger
added browserify version of ngeohash

npm install -g browserify
npm install ngeohash --save
browserify -r ngeohash -s -o ngeohash.js
zoom to a rectangle
zoom to bbox of geohash
add zooming to different levels
added overlay of geohash to top-left of display
loop back to start, and clear rectangles
now automatically generate the hierarchy
use edinburgh as starting point
small switch in edinburgh geo coords
Merge branch 'hierarchy'