Add deploy:<stage> tasks & Deploy staging by default & Refactoring

* Add `deploy:<stage>` tasks
* Deploy staging with default `deploy` task
* Rename `multistage:create_stagefiles` -> `mutistage:init`
* Remove `config/deploy/development.rb` stage file
Is there any noticeable speed difference when running other commands with this require here? I'm inclined to leave it where it's at for the simple fact that it probably doesn't affect performance either way.