Upgrade vertx to 3.8.0. Fixes compatibility with metrics server. (Con…

…sensys#844)

Hobbits binary fix (Consensys#786)

* changed RPCMethod identifiers to match spec

* converted all message values to the binary format indicated in the spec

* mainly a fix to gossip

* now all packets are the correct size and no hex strings are sent over the wire

* last thing to do is fix attestation and block format

* added custom serialization to attestations and beaconblocks

Check that G1 and G2 points lie in the correct subgroups when created (…

…Consensys#741)

Add additional RPC methods and data structures (Consensys#528)

Fix min attestation inclusion bug (Consensys#505)