Adding support for AWS signing of ES requests

Merge pull request #265 from ExpediaDotCom/esSign

Terraform changes for ES signing configs

Minor fixes and enhancements

• refactor reader and store to include isRangeQuery FieldName metadata changes
• adding support for overriding cassandra backend retries and backoff factor
• fix for service metadata index template

Minor improvements in docker image

Docker image has dockerize to help docker-compose wait for kafka in local development

Bi-weekly Release

Noticeable changes:

• Making ElasticSearchWriter have no dependency on ES availability at startup
• Cassandra resiliency- retry connection upon failure

Bi-weekly Release

This release contains some performance improvement fixes and remove the dependency on service tag in the span.

Bi-weekly release

Major changes:

• Added grpc health check service

Bi-weekly Release

This release is coming after a long time as we had no major updates except following fix

• Added a new transformer in reader that refills the infrastructure tags in all the spans of a given service. Fix issue#592

Bi-weekly release

• added endpoint for getting traces details for given traceIds
• allow to override gc opts with default as G1GC
• merge client and server spans (new transformer) that cross service boundaries

Bi-weekly release

• transformers refactoring for better readability
• add url tag key in autogenerated span, if present in the root span
• adjust clock skew based on parent
• handling ES index_not_found exception
• bug fix where span forest should have only one tree after the merge operation

Fix time zone bug

Fix time zone bug