1.6

• fix issue where agent closure with a label referencing a param variable causes test failures (#252) @ballab1
• Issue #240 Avoid withEnv leaking environment out of scope (#246) @Alex-Vol-SV
• Issue #247 Fix withCredentials when usernamePassword is used (#248) @Alex-Vol-SV
• Issue #224 support lazy library class loading (#244) @brianeray
• Issue#243 Skip subsequent stages if stage fails (#245) @IncredibleLou
• Added support for missing post conditions (#226) @bacarroll
• Issue #209 - re-expose assertj-core API (#215) @brianeray
• retry mock should actually retry (#214) @jsok

🚀 New features and improvements

• Add when support for tag and buildingTag() (#220) @halkeye
• Add mocks for docker singleton (#250) @nre-ableton