Use cwd for aux dir
Use cwd for aux dir

Summary: It's easy to litter up `~/Library` lets put it in the cwd and then we can make it more explicit

Reviewed By: zsol

Differential Revision: D7687780

fbshipit-source-id: dcb8fca7607b37ff39ff85caf36cb69476ea5fe1

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl