hy/TODO

 - Tree mangle routines
   + (fn []) displacement to top of relevent scope, replace with
     nameref.

   + Manage imports on the fly (for stuff like literal HyExpressions) or
     a (-> read eval print loop)

   + Use (def) to imply global foo

 - New Builtins:
   + While

 - New macros:
   + loop

 - nREPL type thing:
   + SocketIO endpoint
   + Socket endpoint
   + hyde (hy-dee-e - thanks arno)

 - Builtin type checking (@params(HyExpression, HyList, HyExpression))

 - Better Exception handling
   + linenos in the dump

 - List / Dict comprehensions

 - var-arity [x y & z]

 - core tests (odd? even? true? false?) which
   build out to a lambda / function / expr