Add git-sweep (stolen from Derek Prior)

bin/git-sweep

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+git checkout master
+git fetch
+git remote prune origin
+git branch --merged master | grep -v 'master$' | xargs git branch -d
+
+REMOVABLE=$(git branch -r --merged master \
+  | sed 's/ *origin\///' \
+  | grep -v 'master$' \
+  | grep -v 'production$' \
+  | grep -v 'staging$' \
+  | grep -v '^release' \
+  | grep -v 'next$'
+)
+
+if [[ -z "$REMOVABLE" ]]; then
+  exit 0
+fi
+
+echo "The following remote branches are fully merged and will be removed:"
+for branch in $REMOVABLE; do
+  echo "$branch"
+done
+
+read -p "Continue (y/n)? " -n 1 -r
+echo
+if [[ $REPLY =~ ^[Yy]$ ]]; then
+  echo "$REMOVABLE" | xargs git push origin --delete
+fi