Update README.md
Adding commands to create and start instances, and update php layer.
Misc updates to commands. added option to set ssh key using local path for create app command.
Merge branch 'develop' of github.com:onema/opsworks-demo-console into develop
New command (create all), and updates to stack chef command to accept repository revision. RunTimeException added.
Merge pull request #2 from onema/develop

Develop