update changelog
pass API::RESTv1_1 trait to Net::Twitter

Twitter v1 API will go away on June 11th, so it's about time we switch
to the v1.1.
changelog

Fixes #7
Merge branch 'apiv1_1' into devel
fix auth error logging

Dancer.pm doesn't export core() method, so we call
Dancer::Logger::core() instead.
changelog
Merge branch 'core-logging' into devel

Fixes #8
prep for release
Merge branch 'devel'