initial core docs, class diagram

doc/source/architecture.rst

@@ -0,0 +1,4 @@
+GPy Project Architecture
+========================
+
+

doc/source/conf.py

@@ -83,8 +83,13 @@ extensions = [
     #'sphinx.ext.coverage',
     'sphinx.ext.mathjax',
     'sphinx.ext.viewcode',
+    'sphinx.ext.graphviz',
+    'sphinx.ext.inheritance_diagram',
 ]
 
+#---sphinx.ext.inheritance_diagram config
+inheritance_graph_attrs = dict(rankdir="TB")
+
 #----- Autodoc
 #import sys
 #try:

doc/source/index.rst

@@ -25,6 +25,12 @@ Tutorials
 
 Several tutorials have been developed in the form of `Jupyter Notebooks <https://nbviewer.jupyter.org/github/SheffieldML/notebook/blob/master/GPy/index.ipynb>`_. 
 
+.. toctree::
+   :maxdepth: 1
+   :caption: Architecture
+
+   architecture
+
 .. toctree::
    :maxdepth: 1
    :caption: For developers