Get Ethereum Relay to Compile (#21)

* Update dependencies

Upgrades Substrate based dependencies from v2.0.0 -> v2.0.0-alpha.1
and uses the `jsonrpsee`'s new feature flags. The actual code hasn't
been updated though, so this won't compile.

* Use `RawClient`s from `jsonrpsee`

* Update to use jsonrpsee's new API

* Hook up Ethereum Bridge Runtime, Relay, and Node Runtime

* Bump `parity-crypto` from v0.4 to v0.6

Fixes error when trying to compile tests. This was caused by
`parity-crypto` v0.4's use of `parity-secp256k1` over `secp256k1'.
Using the Parity fork meant multiple version of the same underlying
C library were being pulled in. `parity-crypto` v0.6 moved away from
this, only relying on `secp256k1` thus fixing the issue.

bridges/bin/node/runtime/Cargo.toml

@@ -30,6 +30,11 @@ default-features = false
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
 git = "https://github.com/paritytech/substrate/"
 
+[dependencies.pallet-bridge-eth-poa]
+version = "0.1.0"
+default-features = false
+path = "../../../modules/ethereum"
+
 [dependencies.frame-support]
 version = "2.0.0-alpha.2"
 default-features = false
@@ -91,6 +96,11 @@ default-features = false
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
 git = "https://github.com/paritytech/substrate/"
 
+[dependencies.sp-bridge-eth-poa]
+version = "0.1.0"
+default-features = false
+path = "../../../primitives/ethereum-poa"
+
 [dependencies.sp-consensus-aura]
 version = "0.8.0-alpha.2"
 default-features = false
@@ -162,6 +172,7 @@ default = ["std"]
 std = [
 	"pallet-aura/std",
 	"pallet-balances/std",
+	"pallet-bridge-eth-poa/std",
 	"codec/std",
 	"frame-executive/std",
 	"frame-support/std",
@@ -171,6 +182,7 @@ std = [
 	"serde",
 	"sp-api/std",
 	"sp-block-builder/std",
+	"sp-bridge-eth-poa/std",
 	"sp-consensus-aura/std",
 	"sp-core/std",
 	"sp-inherents/std",