Basic implementation of Nearby Pages page.

Links, map on the side forthcoming.
Merge remote-tracking branch 'upstream/master' into nearby_pages
Added "Nearby Pages" page.

Added a view that gives a map and list of the thirty pages nearest
to the user's position (from geolocation). Fixes #534
Merge branch 'hub' into nearby_pages

Conflicts:
	localwiki/maps/urls.py
	localwiki/themes/sapling/assets/css/site.css
Fix up nearby pages.