Refactor api-promise/rx (#566)

* Use a generic abstract OnCall

* Add OnCall for Promise

* First run at fixing extrinsics

* Fix types

* Make submittable extrinsic work

* Move file

* Make derive work

* Fix types

* Only call metadata once

* Make tests pass

* Put event emitter in apirx

* Fix small bugs

* Fix tests

* Fix bug decorateStorage

* Make tests pass for tx

* Move rpc base to apirx

* Fix lint

* Fix small bugs

* Fix bug with isSubscription

* Fix codeclimate

* Revert

* Add tslint disable line

* Fix lint

* Skip e2e

* Typo

* Lint

* Re-add combinator back

* Add ._rx in Base

* Make extrinsics work

* Update derivex

* Fix bug lint

* Fix circular dep

* Fix bug e2e

* Remove useless check

* Add description comment

* Clean stuff

* Move assert to Base

* Bump version, update CHANGELOG

* Make _rx private

* Private emit

packages/type-storage/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/storage",
-  "version": "0.39.12",
+  "version": "0.40.0",
   "description": "Generic wrapper wrapper around state storage",
   "main": "index.js",
   "engines": {
@@ -31,7 +31,7 @@
   "dependencies": {
     "@babel/runtime": "^7.2.0",
     "@polkadot/keyring": "^0.33.34",
-    "@polkadot/types": "^0.39.12",
+    "@polkadot/types": "^0.40.0",
     "@polkadot/util": "^0.33.34",
     "@polkadot/util-crypto": "^0.33.34"
   }