v0.6.0

• Prebuilt flask server images for faster image build
• More and better methods in Ebonite client
• Pipelines - chain Models methods into one Model-like objects
• Refactioring of image and instance API
• Rework of pandas DatasetType: now with column types, even non-primitive (e.g. datetimes)
• Helper functions for stanalone docker build/run
• Minor bugfixes and features