Alias Webmachine::Resource::Callbacks#authorized? as is_authorized?

For backwards compatibility
Alias Webmachine::Resource::Callbacks#conflict? as is_conflict?

For backwards compatibility
Rename Webmachine::Resource::Callbacks#generate_etag to Webmachine::Resource::Callbacks#etag
Alias Webmachine::Resource::Callbacks#etag as generate_etag

For backwards compatibility