Add some example git aliases

git-aliases

+[alias]
+  co = checkout
+  last = log -1 HEAD
+  unstage = reset HEAD --
+  ls = ls-tree --full-name --name-only -r HEAD
+  vis = log --graph --decorate --oneline --all
+  today = log --since "yesterday"
+  squash = "!_git_squash() { git rebase -i HEAD~$1; }; _git_squash"
+  stashed = stash list --pretty=format:'%gd: %h [%ar] %s'