class Roda::RodaPlugins::ErubisEscaping::Eruby

a local variable instead of a constant lookup.
<%= %> are broken (e.g. <%= foo if bar %> ), and optimize by using
Fix bug in Erubis::EscapedEruby where postfix conditionals inside

def add_expr_escaped(src, code)
  src << " #{@bufvar} << _erubis_xml_helper.escape_xml((" << code << '));'
end