Experimental removal of Angel parrot.

[jmhobbs]

To see if we can get the tests fixed, I'll remove the gifs, then re-add them. cc #268

[jmhobbs]

What on earth. The error just moved to different files.

  1) gifs in HD should be read only:
     AssertionError: beretparrot.gif has bad permissions, 0664
      at test/permissions.js:19:13
      at Array.forEach (native)
      at Context.<anonymous> (test/permissions.js:17:24)
  2) gifs in SD should be read only:
     AssertionError: angryparrot.gif has bad permissions, 0664
      at test/permissions.js:35:13
      at Array.forEach (native)
      at Context.<anonymous> (test/permissions.js:32:21)

https://travis-ci.org/jmhobbs/cultofthepartyparrot.com/builds/452098838

cc @lucymhdavies and #269