Morpfw

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- reduce default size of creator/state fields to 256
- added vacumming capability to clean soft-deleted items
- added cascading deletion support
- remove dependencies on jsonobject, hydra
- added type referencing/backreferencing support
- allow including deleted items when querying
- added automated constructor of SQLA ORM model from dataclass
- save sha256sum of uploaded blobs
- added title provider for models and collection
- stop using autoscan in tests
- added ESCapableRequests which provide ES client
- fix count() implementation in ES storage
- added cli tools for elasticsearch index update
- added beaker.session and beaker.cache support
- fix ES aggregation issue and timezone issue
- added limit support in aggregate methods

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* ``dataclass`` based schema definition powered by ``inverter``

* Simpler authn integration steps

* ``colander`` based data validation

* Simpler configuration structure with ``configuration`` option.

* Async tasks does not create request by default, but rather provide
parameter for instantiating request. Allowing finer control over commits
and database connection locks.

* Added memoization helpers and memoize regularly used model functions

* Added timezone support in PAS

* Stability fixes

* And many others ....

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Changes since 0.2.x:

* Authentication is no longer a mounted app, this simplify programming as auth
models are no longer treated special

* Get rid of composite identifier as flat management of models is more
maintainable and less confusing

* Allow specifying prefix url for auth models, or devs can simply mount them
wherever they link