Nearby entry in main menu.

Includes pull to refresh, titles, distance and thumbnails.

Distances update in real-time as you walk around.

Long-press item to open in Maps.

Direction arrows pointing to geo-coords of article.

Refactored thumb retrieval - no more stutter.

Nearby images now larger and round. Arrow moves around image.

Capitalized "Maps".

Now shows in meters or feet appropriately.

Only shows arrows if device can supply heading data.

Change-Id: I866e95978d0e369a826fb7164c55cb954fcdc80c