git: added tree alias

setup

@@ -4,5 +4,8 @@ cd "$( dirname "$0" )"
 
 git config --global user.name 'Fabian Peter Hammerle'
 git config --global user.email 'fabian.hammerle@gmail.com'
+
 git config --global core.excludesfile "${PWD}/gitignore"
 
+# alias
+git config --global alias.tree "log --graph --abbrev-commit --decorate --format=format:'%C(red)%h%C(reset)%C(bold red)%d%C(reset) %C(dim green)(%ar)%C(reset) %C(bold black)%s%C(reset) %C(dim white)(%an)%C(reset)' --all"