Upgrade ember-qunit

[nlfurniss]

Need to upgrade in order for ember-canary tests to not fail right out of the gate

[nlfurniss]

Dunno why we're linting node_modules, but I'm going to land this anyway since we're moving to GH CI

$ eslint . --cache
/home/travis/build/ember-cli/ember-fetch/node_modules/.bin/sha.js
   3:18  error  'require' is not defined      no-undef
   4:12  error  'process' is not defined      no-undef
  15:9   error  'process' is not defined      no-undef
  16:14  error  Unexpected console statement  no-console
  19:5   error  Unexpected console statement  no-console
  24:3   error  Unexpected console statement  no-console
  25:3   error  Unexpected console statement  no-console
  26:3   error  Unexpected console statement  no-console
  29:6   error  'process' is not defined      no-undef
  30:17  error  'process' is not defined      no-undef
  37:21  error  'require' is not defined      no-undef
✖ 11 problems (11 errors, 0 warnings)