Speedup: Use tensordot instead of einsum
On branch theano
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

	modified:   menpofit/transform/modeldriven.py

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   menpofit/lucaskanade/appearance/__init__.py
	modified:   menpofit/lucaskanade/appearance/alternating.py