Remove captions temporarily due to Sphinx bug.
Remove captions temporarily due to Sphinx bug.

Captions on graphviz objects are broken in Sphinx 1.3.1. The bug has
been fixed but the fix hasn't been released yet, so we should avoid
using captions on graphviz graphs for the time being.

See https://github.com/sphinx-doc/sphinx/issues/1788

Osmose/snippets-service,schalkneethling/snippets-service,glogiotatidis/snippets-service,mozilla/snippets-service,glogiotatidis/snippets-service,akatsoulas/snippets-service,Osmose/snippets-service,glogiotatidis/snippets-service,mozilla/snippets-service,mozmar/snippets-service,Osmose/snippets-service,glogiotatidis/snippets-service,akatsoulas/snippets-service,mozmar/snippets-service,akatsoulas/snippets-service,schalkneethling/snippets-service,Osmose/snippets-service,schalkneethling/snippets-service,mozilla/snippets-service,akatsoulas/snippets-service,mozilla/snippets-service,mozmar/snippets-service,schalkneethling/snippets-service,mozmar/snippets-service