function loadFromFile(path, callback) {
    var fs = _dereq_('fs');
    fs.readFile(path, function(err, buffer) {
        if (err) {
            return callback(err.message);
        }

        callback(null, util.nodeBufferToArrayBuffer(buffer));
    });
}
Loads a font from a file. The callback throws an error message as the first parameter if it fails
and the font as an ArrayBuffer in the second parameter if it succeeds.
@param  {string} path - The path of the file
@param  {Function} callback - The function to call when the font load completes