Add support for events with DOMHighResTimeStamp
Add support for events with DOMHighResTimeStamp

Merge pull request #143
jacobmarshall-etc/bugsnag-js,jacobmarshall-etc/bugsnag-js,Omniroot/bugsnag-js,jacobmarshall/bugsnag-js,jacobmarshall/bugsnag-js,Omniroot/bugsnag-js