Adding some comments to the first section of Git.
Removed trailing command line prompts in code blocks in Git section.
Comments on git section up to 'Collaborating'.
Added comments to Git:Collaborating.
Added comments to 'Git:Conflicts' section.
Updated broken glossary links.
Add key points/git basics review.
Add Git Review with imgs.
Merge pull request #1 from mollygibson/book

Add Comments and Edits to Git Section