F insert auth

See merge request !56

F cache version

See merge request !46

when hashing entities

FIX: if multiple updates for one entity exist, the retrieve would result in an slim <Entity id='255'/> object

REL: Release 0.5.0

Closes #36

See merge request !54

MAINT: Deprecate `parent` keyword in yaml datamodel

See merge request !53

Resolves #36

Emacs extras

See merge request !52

Some small changes to the YAML documentation.

See merge request !51

ENH: allow using the parser as cmd line tool

See merge request !50