Publish ssz_types (and deps) to crates.io (#468)

* Rename `hashing` crate to `eth2_hashing`

* Add license, desc to eth2_hashing Cargo.toml

* Remove merkle root from eth2 hashing

* Remove old benches folder (zombied from old branch)

* Add docs to eth2_hashing

* Prepare tree_hash for publishing on crates.io

* Update deps to use crates.io instead of paths

* Update all crates to pull ssz from crates.io

* Remove cached_tree_hash, add patches to manifest

* Fix compile error in benches

* Remove unused code

* Fix fake_crypto compile error

eth2/utils/eth2_hashing/fuzz/.gitignore

@@ -0,0 +1,4 @@
+
+target
+corpus
+artifacts

eth2/utils/eth2_hashing/fuzz/Cargo.toml

@@ -0,0 +1,22 @@
+
+[package]
+name = "hashing-fuzz"
+version = "0.0.1"
+authors = ["Automatically generated"]
+publish = false
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies.hashing]
+path = ".."
+[dependencies.libfuzzer-sys]
+git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_hash"
+path = "fuzz_targets/fuzz_target_hash.rs"

eth2/utils/eth2_hashing/fuzz/fuzz_targets/fuzz_target_hash.rs

@@ -0,0 +1,9 @@
+#![no_main]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate hashing;
+
+use hashing::hash;
+
+fuzz_target!(|data: &[u8]| {
+    let _result = hash(data);
+});