Feature release 0.7.0

Support for Redis as external cache store (#72) Introduce statefile "index-cache.yaml" to improve startup speed (#91)

Bug Fixes

Fix Prometheus monitoring for multitenancy (#123) Fix double put and object validation occur introduced in fix for #125 (#131)

Other

Upgrade to Helm 2.9.1 Update CI image to use Go 1.10 Add docs on Prometheus metrics (#128)