quantopian/zipline — pull request #429 by llllllllll (2014-11-07 21:59:27+00:00)
Title: simple transforms

Removes the old transform classes and machinery to make simple transforms use history under the hood.
Changes the `add_transform` method to accept a string naming the simple transform and a window length (unless you pass returns).

simple transforms are now actual methods on the SIDData that do internal calls to history and apply the proper transforms.