* initiate cache
* imports fix
* add in feature config flag
* utilize a dynamic set of subnets
* Merge branch 'master' into att-subnets
* add in feature config flag
* Merge branch 'att-subnets' of github.com:prysmaticlabs/prysm into att-subnets
* Merge branch 'master' of https://github.com/prysmaticlabs/geth-sharding into att-subnets
* shift
* more changes
* gaz
* Update beacon-chain/rpc/validator/assignments.go
* Update beacon-chain/rpc/validator/assignments.go
* add flag
* Merge branch 'att-subnets' of https://github.com/prysmaticlabs/geth-sharding into att-subnets
* Merge branch 'master' into att-subnets
* Merge refs/heads/master into att-subnets
* no double flag
* Merge branch 'att-subnets' of github.com:prysmaticlabs/prysm into att-subnets
* amend committee ids to better name
* gaz
