v0.4.0

CalibrateEmulateSample v0.4.0

Diff since v0.3.0

Merged pull requests:

• Refactor and extend RF interface for more flexible kernels. (#220) (@odunbar)
• Low rank normalization (#227) (@odunbar)
• RF emulator documentation (#232) (@odunbar)
• added RF to buildkite (#235) (@odunbar)

Closed issues:

• Input normalization fails when ensemble size in EKI less than number of parameters (#225)
• interface for defining user-priors (#228)
• SVD truncation for vector RF (#229)
• Sample stage for GCM application (#230)
• ignore.. (#231)
• Documentation (beyond API) and uncomment docs API (#233)
• add new examples/tests into buildkite pipeline (#234)