Improvements
- We're excited to announce the addition of a new Node VMs page to the UI that provides a curated view of the cpu, memory, garbage collection, and event loop metrics that we have added over the past several releases of the node agent and native-metrics module. - For more information, see our documentation. 
- Added instrumentation of When.js promise library. - Previously, the transaction state could get lost when multiple promises resolved close to each other. 
- Fixed name of environment variable in error message when configuration file cannot be found. Thanks to @Maubic for the contribution! 
- Updated tests to work with the latest version of Node 7.