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/boolean-bitfield/Cargo.toml

@@ -1,11 +0,0 @@
-[package]
-name = "boolean-bitfield"
-version = "0.1.0"
-authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
-
-[dependencies]
-ssz = { path = "../ssz" }
-bit-vec = "0.5.0"
-serde = "1.0"
-serde_derive = "1.0"