fix #83 - Bug where rating data was not being copied to the view.

There was a static value (4) where the value read from the form
should have been. This is fixed.

This change can be tested by performing the following actions.

* Click the Brew button to add a new brew.
* Select 1 for the rating, click Save.
* Recipe view should show the rating as 1.
* Click Edit, this view should show the rating as 1.
* Change the rating to 5. Click Save.
* Recipe view should show the rating as 5.
* Click Edit, this view should show the rating as 5.

I was not able to successfully get the Coffeescript tests to pass. I think this is due to me having a new version of Coffeescript and the test being written to an older version.