v0.1.0

• Full revamp of Protean codebase to adhere to DDD principles
• Add Domain Composition root, with support for the definition of multiple domains in a project
• Support for Domain Layer elements: Aggregates, Entities, Value Objects, Domain Services, and Domain Events
• Support for Application Layer elements: Application Services, Data Transfer Objects, Repositories, Subscribers and Serializers
• Support annotations to register elements with Domain
• Complete revamping of Repository layer, and introduction of an underlying DAO layer
• Add Unit of Work capabilities to support ACID transactions
• Collapse SQLAlchemy and Flask implementations in Protean itself temporarily, until API stabilizes
• Rename success flag on Response to is_successful
• Rename message attribute in Response object to errors with a uniform structure in all error cases