Z3c.authviewlet

~~~~~~~~~~~~~~~~~~

- Moved files in `z3c.authviewlet.browser` to `z3c.authviewlet` as
we only have browser code in this package.

- Broke dependency on `zope.app.publisher` by defining our own
``ILogin`` interface.

~~~~~~~~~~~~~~~~~~

- Added `i18n domains` to allow translation (done in `z3c.locales` package).

~~~~~~~~~~~~~~~~~~

- Moved authentication viewlet implementation from `z3c.layer.pagelet`
to this package.

- Initial release.