added script that generates pdf picture of qubiter's class graph usin…

…g graphviz. That pdf is now part of the sphinx_doc at readthedocs

qubiter/run_all_py.py

@@ -16,7 +16,7 @@
     '__init__.py',
     'run_all_nb.py',
     'run_all_py.py',
-    'setup.py'
+    'class_diagram.py'
 ]
 for dir_name in dir_whitelist:
     for fname in os.listdir(dir_name):