The regex in your test expression has a small mistake. woff(2) means that it always looks for woff2 and just captures the 2 in a separate group. If you add a ? after it, webpack should be able to recognize woff as well:
test : /\.(ttf|eot|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/,
loader : 'file-loader'
Please let me know if this worked.