Updates

Here is the current living proposal:

• rename TracerSource to TraceProvier
• rename TraceOptions to TraceFlags

Original Post

From a naming standpoint, we currently deviate from the spec in two areas trace-related:

• our module name is "trace", the specification calls it tracing: https://github.com/open-telemetry/opentelemetry-specification
• we have a TracerSource, that is called TracerProvider: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/api-tracing.md#obtaining-a-tracer

I think it's important we ensure that naming is as consistent with the spec as possible, and best to do before we reach beta. Thoughts?