Actions use Backbone methods instead of HTTP methods

[neocotic]

I want to try and see if I can remove the need to reverse the method lookup for the internal Backbone methodMap:

var methodMap = {
  'create': 'POST',
  'update': 'PUT',
  'patch':  'PATCH',
  'delete': 'DELETE',
  'read':   'GET'
};

This will allow this plugin to be more integrated with Backbone itself and thus not be bound strictly to HTTP. The API would be something like the following then:

var Book = Backbone.Model.extend({
  urlRoot: '/books',

  actions: {
    buy: {
      data: {
        referrer: 'Amazon'
      }
    },

    getPages: {
      url:    'pages',
      attrs:  'pageCount',
      method: 'read'
    }
  },

  initialize: function() {
    Backbone.Do(this);
  }
});

I will maintain the global defaultMethod but this may be changed to read which is not exactly the corresponding value for the existing default HTTP method (i.e. POST).

[neocotic]

Accidentally closed.

[neocotic]

This has been addressed by PR #14.