Changed exit status of program to successful.
Merge pull request #216 from fs0/master

Exit status of game
Added new file main_menu.cpp to CataclysmWin.cbp
Merge branch 'master' of https://github.com/TheDarklingWolf/Cataclysm-DDA
Main menu tweaks, hjkl readded to navigate, changed c_blue to c_white for readabililty.

Centerd bionic screen.
Added missing brackets.
Merge pull request #218 from fs0/master

Missing brackets in newcharacter.cpp
Make diffuse mongroups use rl_dist() for distance calculation so they can tile.
Center forest monsgroups in the overmap.
Added 'Dark Days Ahead' to app window, will be adding version numbers when applicable.
Prevent monsters with no path from following us down stairs. Fix contributed by Uronym.