Address of git repositories of some nethack4 developers.

 * ais523's: http://nethack4.org/media/nethack4.git
 * scshunt's: git://gitorious.org/nitrohack/scshunt.git
 * dtsund's: https://github.com/dtsund/nethack4.git
 * jonadab's: https://github.com/tsadok/nethack4.git
 * esr's: git://gitorious.org/nitrohack/esr-nethack4
 * wheals: https://github.com/wheals/nethack4.git