RLS: Update github tools from IPython master.
DOC: Remove unneeded mailmap option.
DOC: Add github sphinx extension.
DOC: Move CHANGES.txt to old_changes in docs.
DOC: Point to changes in the docs.
DOC: Release note stubs for 0.5.0
DOC: Silence sphinx warning. Update document title.
DOC: Rearrange what's important. Fill in some stubs.
DOC: Include deprecations in section header.
DOC: Fill-in deprecation notes.
DOC: Add update from Vincent.
BLD: Remove CHANGES from setup.py
DOC: Add Justin's changes.
DOC: Fix bullet list.
DOC: Add mosaic plots to docs.
DOC: Add crossref link.
DOC: Add crossref link.
ENH: Add StataWriter to api.
DOC: Add StataWriter to docs.
DOC: Fill in stubs. At Josef's notes. Fix links.