make the script more general

change the repo path to ~/ because the configs might as well lay in a different
home directory. In addition I've add a variable which brings the user back to
his starting point.

general/update_dot_files/update_dot_files.sh

@@ -1,5 +1,7 @@
 #! /bin/bash
-cd /home/andreas/dot_files/
+directory=`pwd`
+cd ~/git_repos/dot_files/
 git add .
 git commit -m "update configs"
 git push
+cd $directory