Fix a bug with request serialization, which produced URLs like /4/Models/{u'URL': u'/4/Models/KMeans_model_python_1465603823795_6', u'type': u'Key<Model>', u'name': u'KMeans_model_python_1465603823795_6', u'__meta': {u'schema_name': u'ModelKeyV3', u'schema_version': 3, u'schema_type': u'Key<Model>'}}. What's even more disturbing is that these URLs used to work before...
Fix a bug with request serialization, which produced URLs like /4/Models/{u'URL': u'/4/Models/KMeans_model_python_1465603823795_6', u'type': u'Key<Model>', u'name': u'KMeans_model_python_1465603823795_6', u'__meta': {u'schema_name': u'ModelKeyV3', u'schema_version': 3, u'schema_type': u'Key<Model>'}}. What's even more disturbing is that these URLs used to work before...

h2oai/h2o-dev,h2oai/h2o-3,michalkurka/h2o-3,jangorecki/h2o-3,mathemage/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,spennihana/h2o-3,h2oai/h2o-dev,spennihana/h2o-3,h2oai/h2o-3,h2oai/h2o-dev,jangorecki/h2o-3,mathemage/h2o-3,spennihana/h2o-3,h2oai/h2o-3,jangorecki/h2o-3,spennihana/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,mathemage/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-dev,jangorecki/h2o-3,jangorecki/h2o-3,mathemage/h2o-3,h2oai/h2o-dev,mathemage/h2o-3,michalkurka/h2o-3,jangorecki/h2o-3,h2oai/h2o-3,spennihana/h2o-3,spennihana/h2o-3,mathemage/h2o-3,spennihana/h2o-3,jangorecki/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-dev,h2oai/h2o-dev,mathemage/h2o-3,h2oai/h2o-3