(function x) -> #'x; (quote . x) no longer causes an error

[nbfalcon]

• Macros that expand to sharpquoted forms are now also prettily printed like
  their quote equivalents:

  (defmacro test (x) `#'x) (test x) ; (test) now looks like #'x instead of (function x)

• Don't error if the macro-expansion contains invalid quote-like forms:

  (defmacro test '(quote . t)) (test) ; (test) now expands to (quote . t) instead of erroring 

  while such macros are arguably wrong, macrostep shouldn't choke on them since
  macroexpand doesn't either.

[nbfalcon]

Fixes #23.