Rework COp to allow all methods to be defined.

a9acfba5 · Arnaud Bergeron · 0056cb74 · a9acfba5 · a9acfba5
--- a/doc/tutorial/extending_theano_c.txt
+++ b/doc/tutorial/extending_theano_c.txt
--- a/theano/gof/op.py
+++ b/theano/gof/op.py