* update go pbs
* protos
* merge
* pbs
* implement first version
* add slashing status endpoints and test
* Merge branch 'master' of github.com:prysmaticlabs/prysm into get_slashings
* add tests
* gaz and goimports
* gaz
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Merge refs/heads/master into get_slashings
* Update proto/slashing/slashing.proto
* Update proto/slashing/slashing.proto
* Update proto/slashing/slashing.proto
* Merge refs/heads/master into get_slashings