function rotateMatrix(matrix, args) {
      var angle = args[0];

      matrix[0] = Math.cos(angle);
      matrix[1] = Math.sin(angle);
      matrix[2] = -Math.sin(angle);
      matrix[3] = Math.cos(angle);
    }
Parses "transform" attribute, returning an array of values
@static
@function
@memberOf fabric
@method parseTransformAttribute
@param attributeValue {String} string containing attribute value
@return {Array} array of 6 elements representing transformation matrix