v0.8.0

• Move fields module to be under main package
• Allow List fields to contain Dict objects
• Elasticsearch adapter bugfixes and model enhancements
• Make views stateful to allow persistence and retrieval
• Auto-generate Event's message_id
• Support pickling of Protean exceptions
• Bugfix - Fetch view objects instead of simply IDs in cache.get_all()
• Bugfix - Generate embedded ValueObject's data properly in to_dict()
• Bugfix - Derive SQLAlchemy field types correctly for embedded value object fields