filling them, this means that an arbitrary bottom can be used
instead of just the x axis (based on patches patiently provided by
Roman V. Prikhodchenko).

New fillbetween plugin that can compute a bottom for a series from
another series, useful for filling areas between lines (see new
example percentiles.html for a use case).

More predictable handling of gaps for the stacking plugin, now all
undefined ranges are skipped.

Fixed problem with plugins adding options to the series objects.

Fixed a problem introduced in 0.6 with specifying a gradient with {
brightness: x, opacity: y }.


git-svn-id: https://flot.googlecode.com/svn/trunk@229 1e0a6537-2640-0410-bfb7-f154510ff394