Bump to 0.3.18.
Bump to 0.3.18.

nathanhammond/ember-cli-qunit,zenefits/ember-cli-qunit,ember-cli/ember-cli-qunit,nathanhammond/ember-cli-qunit,ember-cli/ember-cli-qunit,blimmer/ember-cli-qunit,blimmer/ember-cli-qunit,zenefits/ember-cli-qunit