SIGABRT on invalid image format OS X 10.12 and Node 5.7.1

[dustingraves]

npm test 

> imagemagick-native@1.9.2 test node-imagemagick-native
> tap test/test.js test/test.async.js test/test.streams.js test/test.trim.js

image magick's version is: 6.9.5
test/test.js libc++abi.dylib: terminating with uncaught exception of type Magick::WarningOption: Magick: Unrecognized image format (PNGX)
test/test.js .......................................... 0/1 258ms
  not ok test/test.js
    timeout: 30000
    file: test/test.js
    results:
      ok: false
      count: 0
      pass: 0
      plan:
        start: 1
        end: 0
        skipAll: true
    signal: SIGABRT
    command: /usr/local/Cellar/node/5.7.1/bin/node
    arguments:
      - test/test.js

image magick's version is: 6.9.5
test/test.async.js .................................... 7/7
image magick's version is: 6.9.5
test/test.trim.js ................................... 15/15
total ............................................... 22/23


  22 passing (934.951ms)
  1 failing

npm ERR! Test failed.  See above for more details.

[dustingraves]

This seems to have resurfaced... #60 #61