Merge pull request ethereumjs#230 from ethereumjs/new-release-232

[Release] New release v2.3.2

Merge pull request ethereumjs#218 from ethereumjs/version-2.3.1

Bump version to 2.3.1

Merge pull request ethereumjs#204 from ethereumjs/pre-byzantium-release

[Pre-Byzantium Release] v2.2.2

2.2.1

2.2.0

2.1.0

2.0.1

2.0.0

1.4.0

1.3.0