better docs; pythonic renaming and 3.x compatability; added utils.index_slice


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/pox@573 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/pox