Bump to version 0.3.4

Added validation_error_callback and create_topic to adapter.subscriber

Author: zoidyzoidzoid

setup.py

@@ -4,7 +4,7 @@
     name='pubsub.py',
     author='Superbalist Engineering',
     author_email='[email protected]',
-    version='0.3.3',
+    version='0.3.4',
     description='Python PubSub Adapter for gcloud',
     url='https://github.com/Superbalist/python-pubsub',
     install_requires=[