Added stackTraceLimit to the options of Logger

We are using Kibana, Logstash and Elastic search to pull the logs onto a server to analyize and needed a way to verify a certain schema in the info object passed to mkLogEmitter. While doing this, the stacktrace was actually 2 levels deeper than what getCaller3Info was looking for. Added stackTraceLimit to the options in Logger and passing that number to getCaller3Info fixed our problem.