added optional y axis auto scale on graph zoom (fixes #40)
added optional y axis auto scale on graph zoom (fixes #40)

since flot doesn't expose any option to do this
we have to manually iterate over the graph data
to find the ymin and ymax.  Not ideal, but it
works for now.  Fixing this in flot would be more
elegant.

honeyqa/Anemometer,hankya/Anemometer,lynch0227/Anemometer,box/Anemometer,hankya/Anemometer,hankya/Anemometer,box/Anemometer,box/Anemometer,lynch0227/Anemometer,hankya/Anemometer,honeyqa/Anemometer,honeyqa/Anemometer,honeyqa/Anemometer,box/Anemometer,lynch0227/Anemometer,lynch0227/Anemometer,box/Anemometer