Add git cheat sheet

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diff --git a/git/git-cheatsheet.txt b/git/git-cheatsheet.txt
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+Tag
+
+  git tag -a x.y.z -m "Tag version x.y.z"
+
+Squash multiple commits into one
+
+  git rebase -i HEAD~<N>
+
+  http://www.gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html
+
+Change commit message
+
+  git commit --amend
+
+Revert uncommited changes
+
+  git reset --hard HEAD
+
+Setup remote repository
+
+  On remote:
+
+  1. mkdir proj.git
+  2. chgrp scm proj.git  
+  2. cd proj.git
+  3. git --bare init --shared=all
+  4. chgrp -R scm ../proj.git
+  5. edit description
+  6. cd hooks
+  7. mv post-update.sample post-update
+
+  On local:
+
+  1. git remote add origin scm.codesynthesis.com:/var/scm/proj/proj.git
+  2. git push --tags origin master
+  3. # blow the local project and do clone
+
+Rebasing
+
+  Local (e.g., from a feature branch to master):
+ 
+  git rebase <src> [<dst>]
+  
+  If <dst> is not specified, current branch is used. If <dst> is
+  specified, it is checked out.
+
+  Remote (e.g., merge someone else's changes):
+
+  git fetch
+  git rebase origin[/master]
+  git push --tags origin