Update git-cleanup to be smarter and more informative

* Refresh local state before doing any work
* Only delete branches which have been merged back to master
* List branches deleted and branches remaining

home/bin/git-cleanup

@@ -1,3 +1,17 @@
 #!/usr/bin/env bash
 
-git branch | grep -v master | grep -v '\*' | while read BRANCH; do git branch -d $BRANCH -q; done
+git checkout master
+git pull
+
+DELETED="0"
+git branch --merged master | grep -v master | while read BRANCH; do
+    git branch -d $BRANCH
+    (( DELETED = DELETED + 1 ))
+done
+
+if [[ "$DELETED" -eq "0" ]]; then
+    echo "No branches to clean up."
+fi
+
+echo "Branches remaining:"
+git branch