Organized Readme
Replaced OptParse with ArgParse
Updated argparse implementation
In master.py: edited the parser to accept a configuration file; set command line arguments to get the number of iterations; added argument to comm_spawn to indicate the number of processors, also pass the configuration file to the workers; de-hardcoded the arrays lengths.  In worker.py: edited the parser to accept a cfg file; de-hardcoded the arrays lengths.