Update DSL

[DASpringate]

Having to use quotes in the tag definition is bugging me.

instead of: m("span", opts = list(id = "foo", class = "bar"), "baz")

I want to be able to do: m(span, opts = list(id = "foo", class = "bar"), "baz")

see http://adv-r.had.co.nz/dsl.html