initial version if mult-event timeseries

First version of multi-event timeseries.

Pulls colors off a color array and renders them along with a legend.

Improves the existing timeseries functionality by turning n unique event/host pairs into n series rather than treating all matched events as a single series.

Future goals:
* organize legend by host or service (currently it's first come first render)
* add customizable color pallettes
* make throttling optional

Currently supports:
* Arbitrary number of timeseries from event/host pairs (with anything over around 20 uniques resulting in color collissions)
* customizable line width
* customizable opacity.