Publicize jedi.names and add a first test.

jedi/__init__.py

@@ -37,5 +37,5 @@ good text editor, while still having very good IDE features for Python.
 __version__ = '0.8.1-final0'
 
 from jedi.api import Script, Interpreter, NotFoundError, set_debug_function
-from jedi.api import preload_module, defined_names
+from jedi.api import preload_module, defined_names, names
 from jedi import settings