0.5.2

new metadata index

• refactored metadata& caching into new index package
• provide memory and elasticsearch backend

core:

• allow adding points to the latest, but already saved chunk
• various persister changes. #263
• fix carbon input which was broken since new metrics2.0 version.
• configurable http limits. fix #268
• add ES index fail metrics
• truly validate metrics in ingest

builds & packaging:

• refactor circleCI building
• (graphite-raintank is now graphite-metrictank)
• fix packages for centos 6 & 7, debian/jessie
• add a docker stack
• auto push docker image to dockerhub when circleci builds
• switch to AGPL
• include include storage-schemas.conf in packages

docs:

• various docs update, put docs table in readme
• simplify readme
• add metrictank dashboard, and add on grafana.net