Submitting a patch for 3.4.

1. Allows the user to set command line arguments via a dialog box
2. Parsing - Maps the string which user entered into a list i.e. the same results are produced as when run via terminal/command prompt. The parsing methods returns a list, which is similar to the sys.argv, when you run script from command line.
3. Adds tests for the parsing method
4. Extends mock_idle for point 3

I am on Debian and don't have access to a windows machine. please try to run the tests on windows machine and see if its OK.(cmd handles arguments rather differently.)

Also, should we persist the command line argument that user entered across sessions?