Added HW_test (not-yet-working).
More to HW_test.
fixed digraph implimentation, this required subclassing GeneralizedYoungWall on CombintaroialObject
Resolved conflicts

Merge branch 'master' of https://bitbucket.org/bsalisbury/sage

Conflicts:
	gyw/gyw.py
resolved conflict near imports

Merge branch 'test'

Conflicts:
	gyw/gyw.py