Add cell_orientation to missing tabulate_tensor interfaces.
Fix issue 22.

More fixes required in dolfin and references need updating.
Merge branch 'master' into meg/fix-issue-22

Conflicts:
	ffc/tensor/tensorgenerator.py
Fix various issues.
Update reference data pointer to 901d07fcbdc157b7d7ec06a53af4c38080c34adb.