Add initial synchronize.sh

synchronize.sh

+#!/usr/bin/env bash
+
+# Echo commands and exit on first error
+set -e
+
+echo "Going to synchronize"
+
+remotes=$(git remote)
+echo "Synchronizing: ${remotes}" | tr '\n' ' '
+echo
+
+git checkout master
+
+# Fetch changes from remotes.
+for remote in $remotes; do
+    git fetch "${remote}"
+    theyahead=$(git rev-list --count "master..${remote}/master")
+    echo "Remote ${remote} is $theyahead ahead!"
+    if [ "${theyahead}" -gt 0 ]; then
+        git merge -m "Synchronize ${remote} into master" "${remote}/master"
+    fi
+done
+
+# Propagate changes to remotes.
+for remote in $remotes; do
+    weahead=$(git rev-list --count "${remote}/master..master")
+    if [ "${weahead}" -gt 0 ]; then
+        echo "Propagating ${weahead} changes to ${remote}."
+        git push "${remote}" master
+    fi
+done