Many new features

* Added integration test skeleton for ajax calls
* Created ko-bindings/index.js for loading other ko binding handlers
* Added companies form (not yet working)
* Modified some logic for ajax callback functions
    - error handler now returns the parsed error JSON object form server
    - if a request was successful, the `data` object in the response is
      directly sent to the success callback
    - added $.ajax statusCode handlers
* Modified data/model.js, net/authentication.js  and some other files
  to match the logic above