refactored loading of execution tests

Rustfmt.toml

install-partiy runs brew reinstall parity on osx

Fix mining from spinning

Conflicts:
	ethash/src/sizes.rs
	util/src/uint.rs

Fixing future-current transactions clash

Increase threads to num_cpus & fix author reporting

another batch of rpc improvements

Avoid tracing DELEGATECALL and CALLCODE. Plus tests for it.

complete getting started steps for OS X