* Refactor AttestingIndices to not return any error. Add tests. Add shortcut for fully attested attestation
* attestationutil.ConvertToIndexed never returned error either
* Working with benchmark:
* fix test
* Merge branch 'attestationutil-improvements-0' into attestationutil-improvements-1
* out of bounds check
* Update after merge of https://github.com/prysmaticlabs/go-bitfield/pull/26
* remove shortcut
* Merge refs/heads/attestationutil-improvements-0 into attestationutil-improvements-1
* Merge branch 'attestationutil-improvements-0' into attestationutil-improvements-1
* Merge branch 'attestationutil-improvements-1' of github.com:prysmaticlabs/prysm into attestationutil-improvements-1
* revert test...
* Merge refs/heads/attestationutil-improvements-0 into attestationutil-improvements-1
* Merge branch 'master' of github.com:prysmaticlabs/prysm into attestationutil-improvements-1
* Merge branch 'attestationutil-improvements-1' of github.com:prysmaticlabs/prysm into attestationutil-improvements-1
* Update go-bitfield after https://github.com/prysmaticlabs/go-bitfield/pull/27
* Refactor AttestingIndices to not return any error. Add tests. Add shortcut for fully attested attestation
* attestationutil.ConvertToIndexed never returned error either
* fix test
* remove shortcut
* revert test...