include_recipes parameter for getrecipes service call

Implemented the include_ingredients parameter on getrecipes.

Specifying the parameter gives something like
  {
   "title": "A favorite of mine",
   "ingredients": [
    {
     "quantity": 0.5,
     "unit": "cups",
     "ingredient": "Flour"
    },
    {
     "quantity": 5,
     "unit": "tbsp",
     "ingredient": "sugar"
    }
   ],
   "cookbook": "My book",
   "author": "Travis"
  }

Without specifying the parameter
{
   "title": "A favorite of mine",
   "cookbook": "My book",
   "author": "Travis"
  }

The BooleanField type in the message doesn't actually work with the API
explorer so I just went with a string and check for 'true'