Sync fixes and tweaks

Exposing RPC over Signer WebSockets

implement missing rpc methods and tests

json ipc server version bump

Updated dependencies for windows build

Framework for improved RPC unit tests

Should more or less work now.

* use #[repr(C)] for all hash types

* use a zeroed buffer in crypto::ec::sign

* eliminate most usages of unsafe in crypto::ecdh::agree

* eliminate all possible unsafety in crypto module

Conflicts:
	dapps/src/lib.rs
	parity/main.rs
	parity/signer.rs
	signer/Cargo.toml
	signer/src/lib.rs

* Basic signing queue

* Adding docs

* WebSockets server for signer

* Removing TODO

* Shortening the syntax

* Exposing types from RPC

* Fixing indentation

* Update main.rs