Add WOFF2 version

Generated from the 160 KB TTF version using the following command:

    curl --data-binary '@/tmp/grumpy.ttf' -o 'grumpy.woff2' -H 'Content-Type: font/ttf' -H 'Accept: font/woff2' -X 'POST' 'http://188.226.250.76/'
Merge pull request #1 from mathiasbynens/woff2

Add WOFF2 version