Add sphinxcontrib-blockdiag as a doc build dependency and update the version of Django required when building docs.
Add sphinxcontrib.blockdiag to the Sphinx extensions list.
Rought draft of architecture diagram.
Neaten up labels and lines.
Nicer styling and grouping plus Nginx redirect.
Radioactive components and some notes.
Better blockdiag rendering.
Remove doc build requirements that should be installed by setup.py install.
Merge branch 'feature/issue-947-architecture-diagram' into develop
Merge branch 'develop' of github.com:praekelt/vumi-go into develop