0.8 A lot of improvements and bug fixes

In this release we introduced:

• #8 Improvements in Netty pipeline.
• #9 User configurable log level label name.
• #7 Monitoring of processing statistics (and example of how to export them via Dropwizard metrics).
• #18, #15 Additional validity checks on labels.
• #21 Better send logic. Introduced logic similar to promtail that will send logs when they reach some critical size or timeout is reached.
• #23 Static labels defined at start of the logging system (e.g. in log4j2 configuration) never change. We now serialize them at startup and reuse the resulting string.