Initial pass on `ember new` command
Check for conflicts and prompt for action
Display app name as optional
Process app name from cwd or option
Clarify behavior of generator by renaming it
Pass result into resolve
Refactor stdin event-handling for eventual use of denodeify
Refactor promises with @stefanpenner
Add dry-run option to skeleton
Merge pull request #11 from joefiorini/master

ember new command to create project scaffolding