Several small corrections

I found a couple of things that didn't work with the current OpsWorks configuration (Chef 11.10, Berkshelf 3.x, Rails 4.1).

* Berkshelf now requires the "name" attribute in the ```metadata.rb``` file.
* Added an "environment" section to the Chef JSON in the example on the README.
* OpsWorks Chef was having a hard time finding the cookbook so I moved it up a level in the directory and that seemed to fix the problem.  Did you experience this or am I doing something wrong?

Thanx!
  Richard

NOTE: I should have created separate pull requests, but I'm kinda new at pull requests and don't really have the work flow down yet.  :/