Added core.testing.simulate() that assists in testing.
Added core.testing.simulate() that assists in testing.

 - Simulate reads directly from sys.argv to simulate commands run
   from command line, and is helpful in testing.

fxstein/cement,rjdp/cement,datafolklabs/cement,rjdp/cement,datafolklabs/cement,akhilman/cement,rjdp/cement,fxstein/cement,datafolklabs/cement,akhilman/cement,akhilman/cement,fxstein/cement