TODO

These are mostly ideas, that they're written down here is no guarantee
that they'll ever be done. If you want something done, feel free to
say why or come up with a patch. :-)

pending
  - split out autoscaleMargin into a snapToTicks

grid configuration
  - how ticks look like
  - consider setting default grid colors from each other?

selection
  - user should be able to cancel selection with escape
  - select points

interactive zooming
  - convenience zoom(x1, y1, x2, y2)? and zoomOut() (via zoom stack)?
  - auto-zoom mode?
  - auto-margins

support for highlighting stuff
  - lines
  - points

legend
  - interactive auto-highlight of graph?

labels
  - labels on bars, data points
  - plan "all points" option
  - interactive "label this point" command

interactive hover over
  - fire event with value for points
  - fire event with graph id for lines

support segmented lines
  - put in null value to signify a break in the data set

error margin indicators
  - for scientific/statistical purposes

non-xy based graph types
  - figure out how to integrate them with the rest of the plugin
  - pie charts
  - bar charts with keys instead of x values