add tips for using git

git_tips

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+I keep two branches: 
+  latest
+  master
+
+I have to remotes: (git remote -vv)
+  kitware
+  origin
+
+I let "latest" branch to keep track of kitware, and "master" to track origin:
+  git branch --set-upstream-to=kitware/master latest
+  git branch --set-upstream-to=origin/master master
+
+I can update the "latest" branch by switching to that branch and use a "git pull."
+
+I can merge my "master" branch to whatever is updated from "latest" branch:
+  git merge latest
+
+Set a remote for current branch:
+  git branch -u kitware/master
+
+Fetch objects from a remote:
+  git fetch kitware