Update to a git workflow.

- Remove notes on the pyjuju to simplify the hacking story.
- Update to github/git links and commands for working on the project.
Merge pull request #4 from mitechie/update-hacking

- Remove notes on the pyjuju to simplify the hacking story.
- Update to github/git links and commands for working on the project.

QA
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Pull the branch down and generate the docs with `make docs`.