Updated cpu core lookup to work with OSX lion.
Updated cpu core lookup to work with OSX lion.

mhama/testbot,nritholtz/testbot,uchihara/testbot,joakimk/testbot,tonchidot/testbot,uchihara/testbot,nritholtz/testbot,tonchidot/testbot,joakimk/testbot,mhama/testbot