Add database upgrade script

database-prepare-for-0.2.0.sh

+#!/bin/bash
+
+# This is will prepare a synapse database for running with v0.2.0 of synapse. 
+
+set -e
+
+cp "$1" "$1.bak"
+
+sqlite3 "$1" < "synapse/storage/schema/im.sql" 
+sqlite3 "$1" <<< "PRAGMA user_version = 2;"