Asciidoctor::Converter:Base#handles? method always return false

[ggrossetie]

Here's the implementation of the Asciidoctor::Converter:Base#handles method:

def handles? transform
  respond_to? %(convert_#{transform})
end

When using supports_templates, Asciidoctor will create a CompositeConverter that uses the handles method to find a converter for the specified "transform".
Since the methods are not prefixed by convert_ the handles? method will always returns false.

If we want to stay backward compatible with Asciidoctor 1.5.8, I think we should override the handles? method. Otherwise we should prefix the "convert" methods by convert_.

What do you think?