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.
Merge remote-tracking branch 'upstream/master' into freq

Conflicts:
	overmap.cpp
Implemented loading monster groups from JSON