Tag 0.3.1.

Merge pull request ContinuumIO#61 from ContinuumIO/youngblood/store_p…

…aram_strings

Youngblood/store param strings

Merge pull request ContinuumIO#46 from ContinuumIO/youngblood/add_viz…

…_to_docs

Youngblood/add viz to docs

Merge pull request ContinuumIO#40 from ContinuumIO/pypi_markdown

add markdown conversion for PyPI

Merge branch 'PLSA_ldavis'

add docs config