Bumped version to 0.5.4.dev.
DOC: Add tutorial for groupby PPC argument.
DOC: Typo.
DOC: Remove reference to estimating p_outlier.
BUG: Call numpy.histogram() directly.
DOC: Update demo.
DOC: Fix demo / tutorial.
DOC: More fixes to tutorial.
DOC: Add published papers using HDDM.
DOC: Fix paper list.
Update bumpversion string.
Update bumpversion string.
Update bumpversion string.
Update bumpversion string.
Bumped version to 0.5.4 and updated pymc.