I have Gruff 0.2.8 installed. For the most part it works great. However the following properties don't seem to work:
   * x_axis_label
   * y_axis_label
   * y_axis_increment

I am setting properties such as "title", "title_font_size", and others with no problem. When I try
to set the above properties, however, I get a "NoMethodError" -- undefined method 'x_axis_label=' for
#<Gruff::Line....>