Add fuzzing helper scripts, fix fuzzing bugs (#416)

* Add fuzzing helper scripts, fix fuzzing bugs

The fuzzing dictionary was old, so I updated it. Also, I've added some
simple fuzzing shell scripts that make it a bit easier to run.

Bug fixes:

* Validate function index in local name section before calling callback.
* Fix invalid assert in parse_{float,double}_infinity, which assumed
  that "infinity" is required (it could be "inf").
* Bail out of resolve local names if there is no current function (e.g.
  if attempting to resolve names in an elem offset expression).
* Catch bad_alloc in wast2wasm and wasm2wast. Without this, afl-fuzz
  will see allocation failure as a crash.

* disable exceptions by default, add option, wrap tools in try/catch

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