Adds an option to create/remove scripts for dev

With `--build-dev`, `script/create_staging.rb` will build a *.dev.concord.org server instead of *.staging.concord.org; likewise, `script/remove_staging.rb` with `--remove-dev` will operate on *.dev.concord.org instead of *.staging.concord.org.
Lightweight-MW-dev role.
lightweight-mw.dev.concord.org node