add leaflet mapping

- bower install angular-leaflet-directive
- add leaflet scripts/css to app
- add placeholder map to country view
Merge remote-tracking branch 'origin/master' into leaflet
add leaflet map

- setup map bounds based on country
- parse lat/long as floats in capital info
- show marker for capital
improve map for displaying capital info

- increase maxbounds if capital is outside (Equitorial Guinea)
- display population on map
fade in lazy loaded details

- fade in capital population details
- fade in neighbours list
handle missing capital (fixes #3)

- return empty promise when there is no capital
Merge remote-tracking branch 'origin/master' into gh-pages