Nti-site

==================

- If you are using zope.interface 4.3.0 or greater, you can register
utilities and adapters using ``implementedBy`` (so bare classes) in
a BTreeLocalSiteManager. Otherwise, using an older version, you'll
get a TypeError and may be unable to complete the registration or
transition to BTrees, and the map data may be inconsistent.

==================

- First PyPI release.
- Add support for Python 3.
- Remove HostPolicySiteManager.subscribedRegisterUtility and
subscribeUnregisterUtility. See :issue:`5`. This may be a small
performance regression in large sites. If so we'll find a different
way to deal with it.
- Remove HostSitesFolder._delitemf. It was unused and buggy.
- Add BTreesLocalSiteManager to automatically switch internal
registration data to BTrees when possible and necessary. See :issue:`4`.
- Add :func:`nti.site.hostpolicy.install_main_application_and_sites`
for setting up a database. See :issue:`9`.