If anything, we should track these somewhere else.
And especially now, given that we publish READMEs
on Atmosphere these should definitely not be here.
Remove the concept of a "Special" as a generalization of template tags in HTML parsing and the HTMLjs tree. Just call something that's parsed by hooking the HTML parser a TemplateTag. Don't wrap the return value of getSpecialTag (now getTemplateTag), just require that it be an instanceof HTMLTools.TemplateTag.
Spacebars.TemplateTag is now a subclass of HTMLTools.TemplateTag. Both support `.toJS()`. The same object returned by getTemplateTag is now inserted into the HTMLjs -- that is, the Spacebars compiler creates an HTMLTools.TemplateTag instead of it being created as a wrapper inside HTMLTools. All usages of the words "special" or "special tag" are replaced with "template tag."
