Remove "classic" method_missing and prefer stubs

So, after 2 years, we have stubs back for our method_missing
implementation! Should have kept them before.

The old (obj.$foo || $('foo')).call(obj, 1, 2, 3) style of method
missing is now gone, and stubs are added instead. method_missing (and
stubs) can be turned off with the :method_missing => false option on the
parser. Stubs are turned on by default.