Changes

* Introduction to Git by Scott Chacon (video): http://www.youtube.com/watch?v=ZDR433b0HJY* Git Immersion (great tutorial): http://gitimmersion.com/index.html* Git Magic (from basics to advanced topics): http://www-cs-students.stanford.edu/~blynn/gitmagic/index.html* Git Community Book: http://book.git-scm.com/* Git Ready (tutorials, recipes, and topics): http://gitready.com/* Git Rebase Workflow, explained: http://mettadore.com/analysis/a-simple-git-rebase-workflow-explained/* Interactive Git Cheat Sheet: http://ndpsoftware.com/git-cheatsheet.html