CLC-1220 Move upgrade function from calcentral into its own script, and use it from deploy.rb
CLC-1220 Warmup the app with wget instead of curl, so more assets get fetched
CLC-1220 Need to wait for all update-and-migrate jobs to finish before starting trinidad
CLC-1220 Bringing back serial-execution of Capistrano commands
CLC-1220 Reverting to YH's version of deploy, except that it calls init.d/calcentral to start/stop