more screenshot instructions
advertise timeserieswidget
move rule matching logic into reusable function
pep8 + clarifications
allow graph_options to use a function that modifies the graph
implement 'target coloring policies' as a preference

this is a very powerful way to apply coloring settings
to graphs/targets based on a lot of context.
and it should have never been a concern to the
structured_metric plugin anyway (which has the goal
of converting a metrics list into the tag space)
(except maybe when a plugin defines a graph directly)
bugfix: don't eval all rulesets. return when a rule matches
make cpu steal red cause it's important
bugfix: must process all applying graph_options for each graphs

otherwise the colors won't apply to graphs that were matched
already
fix root fs display color
todo cleanup