Feature: Deploy without flags

[pbnj]

Feature

As a developer, I'd like to be able to deploy new stacks without having to specify all the necessary flags in the command line (e.g. restacker deploy -t webapp -n service_name -l location -c profile -P parameters).

Rather, I should be able to deploy with restacker deploy.

Details

When deploying with restacker deploy, restacker should consume parameter.yml file in local directory.
In the local parameter.yml file, user must specify all the necessary configuration information.