grpc-js and google protobuf version upgrade

Merge pull request #31 from gscheibel/update-grpc

Update gRPC and Protobuf versions

Use grpc-js in production dependencies instead of grpc

Uses the grpc-js library in the distributable package. This avoids users of the library from needing to do native code compilation, with the dependencies for that, and pre-empts the deprecation of grpc for grpc-js.

Bug Fixes

This release contains a fix for issue

1. Unable to inject TextMapPropagator into Tracer

Bug Fixes

This release contains a bug fix where we extract the SpanContext from HttpHeaders but ignoring the case of header keys.

Support Sharable Span and Http Collector

This release contains two important changes:
a) Tracer now supports sharable(single) and non-sharable(dual) styled spans. Sharable span is where client and server span share the same TraceId, SpanId and ParentSpanId. Non-Sharable(dual) style generates server span as a child of client span. The default is sharable, but one can enable tracer to work in dual span mode.

b) Added support for http dispatcher. Besides, haystack-agent(grpc sidecar) as a dispatcher, now we also allow spans to be dispatched to a http collector. For more information read here

Typescript definitions for Tracer and Dispatcher configurations

0.1.4

feat: expose dispatcher config types (#22)

OpenTracing v0.14

Upgraded to OpenTracing version 0.14.Also added the API compatibility test spec.

Typescript definitions and enhanced example

Merge pull request #13 from ExpediaDotCom/fix-build

create tracer using opentracing format in the example

Haystack - Javascript Binding for OpenTracing

Merge pull request #10 from ExpediaDotCom/travis-npm-deploy-fix

removing tag from npm deployer config