@tmbo fixes

CHANGELOG.rst

@@ -13,6 +13,8 @@ Added
 -----
 - options to prevent slack from making re-deliver message upon meeting failure condition.
   the default is to ignore ``http_timeout``.
+- added ability to create domain from yaml string and export a domain to a yaml string
+- added server endpoint to fetch domain as json or yaml
 
 Changed
 -------

rasa_core/domain.py

@@ -420,7 +420,7 @@ def load_from_yaml(cls, yaml, action_factory=None):
         )
 
     @classmethod
-    def validate_domain_yaml(cls, input):
+    def validate_domain_yaml(cls, yaml):
         """Validate domain yaml."""
         from pykwalify.core import Core
 
@@ -429,7 +429,7 @@ def validate_domain_yaml(cls, input):
 
         schema_file = pkg_resources.resource_filename(__name__,
                                                       "schemas/domain.yml")
-        source_data = utils.read_yaml_string(input)
+        source_data = utils.read_yaml_string(yaml)
         c = Core(source_data=source_data,
                  schema_files=[schema_file])
         try: