http://flavio.castelli.name/2007/09/04/howto_use_git_with_svn/
http://stackoverflow.com/questions/16329776/how-to-keep-a-git-branch-in-sync-with-master
http://stackoverflow.com/questions/2695119/is-git-svn-rebase-required-before-git-svn-dcommit
http://stackoverflow.com/questions/2389361/undo-a-git-merge-that-hasnt-been-pushed-yet
# checkout svn trunk revision 123456
git svn clone -r123456:HEAD https://svn.example.com/svn/trunk/project