New feature: send content when not authenticated

You can now register another hook to send content to the client when authentication fails (status code 401 is sent).

Registering the login check handler is now unified with the no_auth handler, the old way of registering the login check handler still works but emits a warning.

Also changed the author name, please forget the old one.

Bugfix release

This release fixes some bugs:

• colons in passwords were broken (thanks to @eremit for the fix)
• when used in applications with the serializer enabled it issued warnings on error

v0.04

• patch for Dancer2 plugin api changes
• fixed duplicate sections in pod
• minor code formatting

v0.0301

• Fixed problems on Perl versions prior to 5.14
• Migrated from Convert::Base64 to MIME::Base64, which is included in perl by default.
• Migrated to Dist::Zilla

v0.02

Made the error handling nicer and more robust