Merge pull request PowerShell#188 from PowerShell/release/0.5.0

Release 0.5.0

Bump version to 0.4.3, update changelog

Merge pull request PowerShell#162 from PowerShell/release/0.4.2

Prepare version 0.4.2 for release

Bump version to 0.4.1

Merge pull request PowerShell#145 from PowerShell/release/0.4.0

Release 0.4.0

Releasing current 0.2.0 binaries before NuGet publishing begins