Don't report anonymous functions with special forms in them

[skazhy]

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Currently, Kibit reports that an anonymous function with a special form in it, (eg, (fn [x] (throw x)) can be shorthanded as throw. As special forms don't play by the rules, this is not working.

Kibit version: 0.1.2.

[danielcompton]

This is a really good idea. Thanks!

[emlyn]

Also macros. It suggests:

Consider using:
  when
instead of:
  #(when %1 %2)

But if I do as it suggests, I get a compilation error: java.lang.RuntimeException: Can't take value of a macro: #'clojure.core/when

Edit: just noticed this was already reported in #142