FEAT: add OO API, remove everything else from main namespace.
ENH: add __version__.
BUG: fix travis-ci config.
BUG: actually fix travis-ci.
BUG: fix version handling.
BUG: fix typo.
BUG: fix imports following change in exposed API.
BUG: fix python 2.6 support.
Merge branch 'add_oo_api'