Update README.MD

Used the excellent [yeoman](https://github.com/yeoman/yeoman) docs to
build the refactored README. Also added a [Code
Climate](https://codeclimate.com/) badge.

README.MD should include only references and general information.
Exactitudes such as licenses, getting started and documentation should be
hosted externally. It now better reflects the essence of Sails and
properly seperates concerns.

update typos