* Verify signatures of attestations
* Implement BLS Signing for attestations
* Remove custody bit 0 from the attestation for now
* Fixes tests for attestations
* Fix tests to ensure they use proper attester indice
* Run gazelle
* Goimports
* Test attestation sigs in block operations
* Change formatting and make sure signatures are actually verified
* Fix duplicate import
* Fix duplicate import from merge
* Organize attestation sig to be conssitent with codebase
* Update to comments
* Change signatures to use aggregation
* Run gazelle
* Change function to return err instead of bool
Also gofmt
* Fix for comments
* Move createAggregationSignature to a function in attestations.go
* provide validator with real keystore public key
* fmt
* build errors buildkite
* readd imports removed by goimport
* gazelle
* address broken tests
* make reference to filename a param
* fmt
* imports
* gazelle
* os remove all
* Use better Temp storage for tests
* testmain approach to avoid repeating expensive operation for each test
* travis lint
* fix test
* nokeystore in status test
* passing
* fix goimports
* initial validator attesthead rewrite based on proposer rewrite
* proceed with fetching committees and tree hashing the canonical head at assigned attester slot
* complete filling the properties of attestation data and all associated root hashes
* add when to attest todo
* finish entire attester client logic
* tests with mocks checked in
* tests passing in client
* stubbed out server implementation
* fixed build due to old property
* regen mocks with new mockgen version
* fixed broken tests
* complete bazel build fix
* address some review comments
* deep proto test
* tests passing after checking for empty committee and crosslink root
* address nishant comments
* WIP - with TODOs
* interface w/ test
* basic test for broadcast
* Add computeStateRoot funciton
* remove custody challenge
* resolve TODO lint issues
* more TODOs
* revert new line in types.proto
* broadcaster comment
* one of several failure condition tests
* Add test cases
* handle compute state error test case
* fix config in validator helpers
* fix tests too
* fix conflict
* partial PR feedback
* remove p2p
* gazelle
* package comment
* Better godoc
