DOCS: windows install notes
ENH: allow numeric values for smoothness

now parameters['p']['smoothness'] = .035 works in addition to = 'Moderately'
BUG: save fails after model.keep has been called

Need to make sure model.nodes_to_fit is a list.  This isn't used for anything,
so it should eventually be removed (or used).
intermediate code, preparing for cleanup/refactor
Merge branch 'docs'
Merge branch 'addl_smoothing_option'
Merge branch 'save_bug'
BUG: make mu_age_parent allow pymc.node

This also needed a change to the similarity prior, which should not
affect anything in the existing code.  but remember to check here if
things look funny down the road.
Merge branch 'interface_cleanup' into interface_cleanup_2
ENH: expose load method at module level
ENH: EOL cleanup
BUG: need to use array for selecting indices

due to change in pandas?
DOC: example of predicting time trends with covariates