version-0.8.0

What's new:

• Added generic view classes for working with models.
• Added pagination support.
• Function-based views are now discouraged; class-based views are recommended.
• Routes no longer specify the HTTP method; instead it should be treated at view level.
• Routes no longer specify permissions; each view should no specify its required permissions using permissions attribute.
• Authentication requirement is now controlled at view level using authentication_required attribute.
• Documentation now lives on readthedocs.io.
• Swagger UI is now part of Colibris; aiohttp-swagger is no longer a dependency.
• Added various tests