Prepare SWF objects representations directly via json.dumps()

... instead of jinja2 templates that are absolutely not suited for this
purpose, and hard to test.

tests/test_swf/test_domains.py

@@ -3,6 +3,7 @@ from nose.tools import assert_raises
 from sure import expect
 
 from moto import mock_swf
+from moto.swf.models import Domain
 from moto.swf.exceptions import (
     SWFUnknownResourceFault,
     SWFDomainAlreadyExistsFault,
@@ -11,6 +12,15 @@ from moto.swf.exceptions import (
 )
 
 
+# Models
+def test_dict_representation():
+    domain = Domain("foo", "52")
+    domain.to_dict().should.equal({"name":"foo", "status":"REGISTERED"})
+
+    domain.description = "foo bar"
+    domain.to_dict()["description"].should.equal("foo bar")
+
+
 # RegisterDomain endpoint
 @mock_swf
 def test_register_domain():
@@ -53,7 +63,7 @@ def test_register_with_wrong_parameter_type():
     ex.body["__type"].should.equal("com.amazonaws.swf.base.model#SerializationException")
 
 
-# ListDomain endpoint
+# ListDomains endpoint
 @mock_swf
 def test_list_domains_order():
     conn = boto.connect_swf("the_key", "the_secret")