Implement Auth Handler

[nfloersch]

Our API will need an authentication capability.

This is defined partly with Swagger, and partly in the Node/Restify code.

In the index.js file there is a section now for the auth handlers.

var config = {
  appRoot: __dirname, // required config
  swaggerSecurityHandlers: {
  	appid: function appidSecurityHandler(req, authOrSecDef, scopesOrApiKey, cb) {
  		cb();
  	}
  }
};

More information about defining the security handler can be found here:
https://github.com/swagger-api/swagger-node/blob/master/docs/release-notes.md
and here
swagger-api/swagger-node#228

For the first iteration just enabling the API to accept an incoming authentication token, and verify it ... even if we just have a hardcode token value... that would be fine.

Then we can hook up the token management to whatever we want - the database, an OAuth service like Facebook or GitHub, etc.