Capture 10 stack frames on traces by default
Capture 10 stack frames on traces by default

Fixes #146

googleapis/cloud-trace-nodejs,keymetrics/trassingue,matthewloring/cloud-trace-nodejs,ofrobots/cloud-trace-nodejs,matthewloring/cloud-trace-nodejs,googleapis/cloud-trace-nodejs,keymetrics/vxx,googleapis/cloud-trace-nodejs,googleapis/cloud-trace-nodejs,matthewloring/cloud-trace-nodejs,keymetrics/vxx,ofrobots/cloud-trace-nodejs,keymetrics/trassingue