rmcgibbo/mixtape — pull request #275 by rmcgibbo (2014-10-27 00:01:24+00:00)
Title: add default in dihedral featurizer

this makes it easier to specify a pipeline, where you're actually going to set the parameters later
```
Pipeline([
('featurizer', DihedralFeaturizer()), ('tica', tICA()), ...
])
```