added some new links
Merge branch 'gh-pages' of https://github.com/dlab-berkeley/2014-03-18-git-fundamentals into gh-pages

Conflicts:
	index.md
added new link to interactive git command cheat sheet (and removed previous test section)
fixed broken link to github help page
Merge pull request #4 from mmortonson/gh-pages

new resource link and fixed broken help link. Thanks @mmortonson!