Re-fix

Re-fixed the arrow key movement.  main.map_visible is now set when
exploration tab is clicked.
Merge remote-tracking branch 'upstream/master'
Merge pull request #19 from Batophobia/master

Re-Implement arrow key movement
Merge remote-tracking branch 'upstream/fredley'
Infinite Map

Fancy animation is gone, but map is now theoretically infinite.
Settlements also added to map display "#"
Merge pull request #20 from Batophobia/master

Map Upgrade
Make world animate again
Add walls and colour map