Merge tag 'v0.6.0rc1' into releases

Version 0.6.0 Release Candidate 1

* tag 'v0.6.0rc1': (295 commits)
  RLS: Set version number to 0.6.0rc1
  DOC: Fix docstrings.
  DOC: Add release notes to index
  DOC: Fix bullet list.
  DOC: Fix directive.
  DOC: Cleanup docstrings.
  DOC: Use formula namespace
  DOC: Use get_rdataset.
  DOC: Make more pythonic
  DOC: Rename file
  DOC: Just use github for roadmap
  MAINT: Update patsy min version
  DOC: Updates to release notes.
  DOC: Use idiomatic statsmodels.
  MAINT: Update release notes with gh-stats
  MAINT: Deal with unicode.
  MAINT: Workaround for existing OAuth not in keyring.
  SQUASHME: Update release notes.
  MAINT: Update mailmap.
  ENH: Allow unit interval for binary models. Closes #2040.
  ...
MAINT: Update folders for build bot
Merge pull request #2061 from jseabold/fix-windows-builds

MAINT: Update folders for build bot
Dropping build-depends on pandas for to avoid circular dependency
RLS: Set version number to final release
Merge tag 'v0.6.0' into releases

Version 0.6.0 Release.

* tag 'v0.6.0':
  RLS: Set version number to final release
  MAINT: Update folders for build bot
  RLS: Set version number to 0.6.0rc2
  TST: Fix test for debian failure.
  STY: Remove commented code. Pep-8
  REF: Refactor for DRY. Handle numpy-like like numpy.
  TST: Silence tests.
  ENH: Make sure MNLogit works with string/factor y
  TST: Test for MNLogit with strings/factors.
Merge branch 'releases' into debian

* releases:
  RLS: Set version number to final release
  MAINT: Update folders for build bot
updated changelog