Node.js agent v2.3.2

Improvements

• Added Node 9 to test suite.
• Removed problematic tests for ancient version of Hapi (7.1).
• Document purpose of throw in tracer to prevent developer confusion.
• Added script for running agent micro benchmarks.
• Added benchmarks for all the Shim and Tracer methods.

Bug fixes

• Fixed a bug with Node >=8.9 that prevented https externals from being recorded.