Add slug field to CategoryResource, update docs.

docs/topics/api/misc.rst

@@ -20,7 +20,8 @@ Returns the list of categories::
              "previous": null, "total_count": 1},
          "objects":
             [{"id": 1, "name": "Webapp",
-              "resource_uri": "/api/apps/category/1/"}]
+              "resource_uri": "/api/apps/category/1/",
+              "slug": "webapp"}]
         }
 
 Use the `id` of the category in your app updating.

mkt/api/resources.py

@@ -271,7 +271,7 @@ class CategoryResource(MarketplaceResource):
                                            weight__gte=0)
         list_allowed_methods = ['get']
         allowed_methods = ['get']
-        fields = ['name', 'id']
+        fields = ['name', 'id', 'slug']
         always_return_data = True
         resource_name = 'category'
         serializer = Serializer(formats=['json'])

mkt/api/tests/test_handlers.py

@@ -556,7 +556,8 @@ class TestCategoryHandler(BaseOAuth):
     def setUp(self):
         super(TestCategoryHandler, self).setUp()
         self.cat = Category.objects.create(name='Webapp',
-                                           type=amo.ADDON_WEBAPP)
+                                           type=amo.ADDON_WEBAPP,
+                                           slug='thewebapp')
         self.cat.name = {'fr': 'Le Webapp'}
         self.cat.save()
         self.other = Category.objects.create(name='other',
@@ -583,6 +584,7 @@ class TestCategoryHandler(BaseOAuth):
         data = json.loads(res.content)
         eq_(data['meta']['total_count'], 1)
         eq_(data['objects'][0]['name'], 'Webapp')
+        eq_(data['objects'][0]['slug'], 'thewebapp')
 
     def test_get_category(self):
         res = self.client.get(self.get_url)