Zemfrog

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* add command secretkey
* Fix: varchar length
* Added db migration based on environment
* Stable release

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* IMPROVE: clean up dependencies

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* fix: missing flask-cors dependency

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* Refactoring app loaders
* IMPROVE: REST API, models & validators
* IMPROVE: added template checks
* IMPROVE: add password validator
* IMPROVE: Compatible with frontend nuxtjs
* NEW: add flask-cors extension

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* FIX: user checks in the test token endpoint
* NEW: support for creating your own app loader
* FIX: Make user roles optional
* FIX: `49 <https://github.com/zemfrog/zemfrog/issues/49>`_

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* IMPROVE: commands to manage nested applications
* Added endpoint for checking token jwt
* Add an endpoint to retrieve one data from the model
* Add schema to limit results
* Added a handler for handling API errors