Remove non-oss exporters (#18)

Only "core" OSS exporters will be supported. All others will be maintained
outside of the core code.

Author: flands

DESIGN.md

@@ -172,26 +172,8 @@ exporters:
   jaeger:
     collector_endpoint: "http://127.0.0.1:14268/api/traces"
 
-  kafka:
-    brokers: ["127.0.0.1:9092"]
-    topic: "opentelemetry-spans"
-
-  stackdriver:
-    project: "my-project-id" # optional, defaults to agent project if run on GCP
-    enable_tracing: true
-
   zipkin:
     endpoint: "http://127.0.0.1:9411/api/v2/spans"
-
-  aws-xray:
-    region: "us-west-2"
-    default_service_name: "verifiability_agent"
-    version: "latest"
-    buffer_size: 200
-
-  honeycomb:
-    write_key: "739769d7-e61c-42ec-82b9-3ee88dfeff43"
-    dataset_name: "dc8_9"
 ```
 
 ### <a name="config-diagnostics"></a>Diagnostics

README.md

@@ -1,4 +1,4 @@
-A variety of exporters are available to the OpenCensus Service (both Agent and Collector)
+A variety of exporters are available to the OpenTelemetry Service (both Agent and Collector)
 
 ## Collector
 
@@ -51,7 +51,7 @@ sampling:
 
 ### Queued Exporters
 
-In addition to the normal `exporters`, the OpenCensus Collector supports a special configuration.
+In addition to the normal `exporters`, the OpenTelemetry Collector supports a special configuration.
 `queued-exporters` offer bounded buffer retry logic for multiple destinations.
 
 ```yaml