[Ready to try] ubuntu-install.sh installs repos and runs spork and edx client in screens for deployment

- Runs pre-install, clone, test for:
  - saasbook/rag `Spring2014 branch`
  - saasbook/hw `Spring2014 branch`
  - saasbook/rottenpotatoes `hw3_solution branch`
- Runs spork process and the rag/run_edx_client loop in scripted named screen sessions Spork, Edx-client.
- Pivotal item Make a deploy package for rolling out rag by maintainers:
  - https://www.pivotaltracker.com/story/show/64134482 
- Does not run unattended.

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- No way to automate the get of the autograder.yml and config file, or edit of them? No.
- What about the symlinks?
- Echo git prompt into profile and source it. Had some trouble with that. ~/.profile maybe?
- Try to collect status info of sub-processes to determine overall success for automatic git tagging.
- Screen clears are commented out.