Directory Restructure (#1163)

* Move tests -> testing

* Directory restructure

* Update Cargo.toml during restructure

* Update Makefile during restructure

* Fix arbitrary path

crypto/eth2_key_derivation/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "eth2_key_derivation"
+version = "0.1.0"
+authors = ["Paul Hauner <paul@paulhauner.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rust-crypto = "0.2.36"
+zeroize = { version = "1.0.0", features = ["zeroize_derive"] }
+num-bigint-dig = { version = "0.6.0", features = ["zeroize"] }
+ring = "0.16.9"
+
+[dev-dependencies]
+hex = "0.3"