add "limit" support
add "graph"/"list" statement support
typo
use priority-ordered first-match target yielding

give every plugin a priority
for every metric, go over (ordered by prio) all plugins,
first one who matches the metric and yields 1 or more targets, wins
those targets are kept and the other plugins are skipped, for that
metric
per plugin track #targets found, display on debug page
more informative network targets
pep8
disable 'clear zoom' entry. it won't be useful anytime soon
forgotten commit for targets/graph generation refactoring

update page template, corresponding to
"refactoring of targets/graphs generation, async, paste"
add catchall plugin for all metrics not caught by your plugins
add 'getting started' menu
put statsd/diamond catchalls in different plugins

...so that we wouldn't get the same target yielded twice,
once for diamond/statsd and later for the "everything unknown"
one.  leverage the fact that if one plugin matches, the next ones
are skipped.
update timeserieswidget, for cleaner urls