* do not use batch for SaveAttestations
* use snappy compression
* Encode / decode everything with snappy
* Add snappy migration path
* batch is probably fine...
* fix test
* gofmt
* Merge branch 'master' of github.com:prysmaticlabs/prysm into remove-batch-attestations
* add sanity check
* remove that thing
* gaz
* Merge branch 'master' of github.com:prysmaticlabs/prysm into remove-batch-attestations
* generate archive proto
* archived committee info
* archive methods added to iface definition
* impl
* update iface
* proto comments
* implement first method
* committee info
* save committee info
* participation checked in
* fully implemented
* tests
* test defs
* db impls done