Add tests for the new object and fix a bug

Each of the individual query chunks has their own test, in addition to a
test for the full combination of parameters that could influence a
query.

There is also a bugfix for the tag query in here, since I want, as much
as possible, to have passing tests on every commit.

test/fixtures/projects.yml

@@ -56,3 +56,13 @@ attendrailsconf:
   user_id: 2
   created_at: <%= today %>
   updated_at: <%= today %>
+
+attendgophercon:
+  id: 5
+  name: Attend Gophercon
+  description: 'Because those little gopher drawing are cute'
+  position: 2
+  state: 'active'
+  user_id: 2
+  created_at: <%= today %>
+  updated_at: <%= today %>