Introduce key suri (path derivation) (#358)

* Introduce key suri (path derivation)

* Errant console.log

* let -> const

* Add seed derivation from path

* Allow new-generation derivation

* Add addFromUri to keyring

* Use addFromUri in testing keyring

* Add suri tests

* Prepare for sr25519 derivation

* CHANGELOG entry

* ed25519 is aligned with substrate

* Bump version

packages/trie-codec/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/trie-codec",
-  "version": "0.35.10",
+  "version": "0.36.0",
   "description": "This is an implementation of the codec for Substrate Trie",
   "main": "index.js",
   "keywords": [
@@ -29,6 +29,6 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/trie-codec#readme",
   "dependencies": {
     "@babel/runtime": "^7.3.4",
-    "@polkadot/util": "^0.35.10"
+    "@polkadot/util": "^0.36.0"
   }
 }