[maven-release-plugin] copy for tag 1.1.5

Permits json null token on nullable fields (openzipkin#1136)

While conventionally, we omit fields rather than passing them as null,
null is valid json and was emitted by at least one tracer. This changes
the parser to ignore fields declared like `"parentId": null`

Fixes openzipkin#1130

[maven-release-plugin] copy for tag 1.1.4

Makes CASSANDRA_ENSURE_SCHEMA work when schema is absent (openzipkin#…

…1128)

Our cassandra docker image comes with the schema installed, which hid a
bug where we failed to properly guard state 0 (keyspace didn't exist).

This fixes the bug and also backfills known upgrade scenarios. Tested
on Cassandra 2.1 and 2.2.

Thanks to @gena01 for reporting

[maven-release-plugin] copy for tag 1.1.3

[maven-release-plugin] prepare release 1.1.0

[maven-release-plugin] prepare release 1.0.0