Added LocalRunner and command line options for stand alone execution

Added a new "CommandLine" option as the default 'mode' for crank.exe. Allows for manual runs of crank without distributed communication.
@davidfowl @abnanda1 
We have been using the word "Worker" with a very specific meaning (Processes spawned and controlled by the agent to generate load), but to anyone outside the team it's just jargon. I'm open to suggestions, but the intent of this parameter is to control the number of processes used in the test.