Triple prepend assets

[typeoneerror]

Updated to latest and assets are now getting "assets" three times when using customHash and prepend.

in:
<img src="assets/icons/stripe.svg">
out:
<img src="http://localhost:4200/assets/assets/assets/icons/stripe.svg">

  var fingerprintOptions = {
    enabled: true,
    extensions: ['js', 'css', 'png', 'jpg', 'gif', 'map', 'svg'],
    generateAssetMap: true,
    prepend: 'http://localhost:4200/',
    customHash: null,
    generateAssetMap: false
  };

Looks specific to customHash again (removing that fixes again) and may be related to ember-cli/broccoli-asset-rev#87

[typeoneerror]

closed in favor of ember-cli/broccoli-asset-rev#99