I'm getting this error: `SassC::SyntaxError - Error: error in C function asset-data-url: uninitialized constant SassC::Script::String`. Maybe its origin is here: https://github.com/sass/sassc-rails/blob/master/lib/sassc/rails/functions.rb#L8 It looks like the `SassC::Script::String` was removed from `sass-ruby` in the commit: https://github.com/sass/sassc-ruby/commit/4731802dcde9a4c17aa6ed9d4e1784c0eeec3159#diff-36146a65a77915929f0dd69a9bb0c214L42