* abstract db interface, kafka build, work in progress
* checkpoint
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* feature flag
* move passthrough
* flag change
* gofmt
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* missing db methods
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* fix interface
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* try using cmake built from source
* lint godocs
* lint godocs
* lint godocs
* Update BUILD.bazel
* Merge branch 'master' into es-exporter
* Merge branch 'master' into es-exporter
* Merge branch 'master' into es-exporter
* Merge branch 'master' of github.com:prysmaticlabs/prysm into es-exporter
* gaz
