tari_crypto v0.0.2

This point release updates the tari_crypto crate to v0.0.2.

Major changes

* RFC content updated to latest as of 21/6/2019
* New benchmarks, using the criterion library
* Commitments have been refactored to be more general and ergonomic
* The Blake256 type has been added, providing a 256bit Blake2b Hash
* Lots of code reorganisations - putting things where they belong
* A Bulletproof Range Proof service has been added
* Challenge has been deprecated in favour of using Digest directly
* Keys and Signatures now implement the Serialize and Deserialize traits
* Schnorr signatures implement Ord
* General cipher trait and ChaCha20 added
* General MessageFormat trait added, helpful for serialising to hex, json and binary
* ExtendBytes trait added, helpful for serialising to binary

.gitignore

@@ -24,3 +24,8 @@ book
 
 # Ignore Code Coverage Report files
 report
+
+# On development branch only. This should be removed for point releases
+Cargo.lock
+
+*.log