Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

eth2/utils/bls/Cargo.toml

@@ -1,12 +0,0 @@
-[package]
-name = "bls"
-version = "0.1.0"
-authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
-
-[dependencies]
-bls-aggregates = { git = "https://github.com/sigp/signature-schemes", tag = "v0.3.0" }
-hashing = { path = "../hashing" }
-hex = "0.3"
-serde = "1.0"
-ssz = { path = "../ssz" }