Replaced useage of List with Vector.
Replaced useage of List with Vector.

This shortened the code and made it a lot cleaner. We didn't need the
doubly linked list functionality so switching to Vector gave us more power
with no loss of functionality.

x140cc/go-html-transform,lambdaX/go-html-transform,rtfb/go-html-transform,dushmis/go-html-transform,d0f/go-html-transform,webfd/go-html-transform,wangcheng711/go-html-transform