Version 0.15.2

Feature requests and some bug fixes:

• allow a callback to be passed into the client.sendPendingData method
• consistency with .Net SDK's use of environment variables in Azure
• add getClient() method to the main module (allows for use of multiple instrumentation keys)
• add support for specifying port number in the endpoint url
• drop .d.ts .js.map and definitelytyped declarations from the package

Alpha build of the v0.15.0 release

This release drops the dependency on the browser JS SDK which was previously loaded from CDN during NPM install. Additionally this release updates the API surface to match the iOS/Android SDKs and includes support for basic system performance monitoring (CPU/Memory).