Use addAssets to add font files.
Use addAssets to add font files.

Since v1.2, 2015-Sept-21:
  Backwards-incompatible change for package authors: Static assets in
  package.js files must now be explicitly declared by using addAssets
  instead of addFiles. Previously, any file that didn't have a source
  handler was automatically registered as a server-side asset. The
  isAsset option to addFiles is also deprecated in favor of addAssets.

  https://github.com/meteor/meteor/blob/devel/History.md

chriswessels/meteor-glyphicons-halflings