- Cleaned up challenge1.py a bit.
- Finished challenge2.py.  It now:
	- Prompts with a list of servers to use for the image source
	- Creates the image
	- Waits for the image creation to be complete
	- Creates the cloned server from the image that was created
- Fixed a typo in challenge2.py
- Updated the README.md with info on the challenge.py script.