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Created by: gkirgizov

Minor PR with the following changes:

• Change RemoteEvaluator interface to accept any Serializable Graph instead of Pipeline
• Drop pipeline.template field because it's unused and creates unnecessary cycle between pipeline & its template
• Introduce Serializable interface with save() & load() methods. Pipeline now it is subclass.
• Replace loading of serialized pipeline with direct classmethod call Pipeline.from_serialized Fixes #679 (closed)