v0.13.0 Release

• Support building with Java 9.
• Add a QuickStart example.
• Remove extraneous dependencies from the Agent's pom.xml.
• Deprecate Window and WindowData.
• Add a configuration class to the Prometheus stats exporter.
• Fix build on platforms that are not supported by netty-tcnative.
• Add Jaeger trace exporter.
• Add a gRPC Hello World example.
• Remove usages of Guava collections in opencensus-api.
• Set unit "1" when the aggregation type is Count.
• Auto detect GCE and GKE Stackdriver MonitoredResources.
• Make Error Prone and FindBugs annotations compileOnly dependencies.
• Deprecate Mean and MeanData.
• Sort TagKeys in View.create(...).
• Add utility class to expose default HTTP measures, tags and view, and register
  default views.
• Add new RPC measure and view constants, deprecate old ones.
• Makes the trace and span ID fields mandatory in binary format.
• Auto detect AWS EC2 resources.
• Add Duration.toMillis().
• Make monitored resource utils a separate artifact opencensus-contrib-monitored-resource-util,
  so that it can be reused across exporters. Please note that this could potentially break your Stackdriver graphs if you're using OpenCensus Stackdriver stats exporter on GCE, GKE or AWS EC2. This is because previously we export all stats with global resource, while now we'll associate stats with a GCE, GKE or AWS EC2 resource based on the environment. You can either update the config of graphs to use the appropriate resource, or override the resource type to global with StackdriverStatsConfiguration.
• Add LastValue, LastValueDouble and LastValueLong. Also support them in
  stats exporters and zpages. Please note that there is an API breaking change
  in methods Aggregation.match() and AggregationData.match().
• Dependency update.