Fixed prompt for when git repo is dirty

Git changed it's output for determining when a working directory is clean.

bashrc

@@ -92,7 +92,7 @@ esac
 # Show the git branch and dirty state in the prompt.
 # Borrowed from: http://henrik.nyh.se/2008/12/git-dirty-prompt
 function parse_git_dirty {
-  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"
+  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] && echo "*"
 }
 function parse_git_branch {
   git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/\1$(parse_git_dirty)/"