initial revision
add some more slides
add info on communication with GitHub using SSH
rename git-dag graph
add slides showing what happens on commit
add gloves ("time to get the hands dirty")
move images to a sub-directory for better organization
add slide explaining what happens when you switch branches
add slides explaining the merge of branches
add slides explaining the difference between fast-forward and non-fast-forward merges
added slide on tools
add information about tags
add README.md
add slides explaining rebase
add info about yEd to README.md
add info about using git locally, without a server
add slides explaining clone and push with success
add more info about use cases for the link between a branch and the upstream branch
push: what to do when someone else already pushed changes
add slide: introduction to merge & rebase