preservationmeter: Add module

* Adds information about record quality to the record base template
* Adds base and preserventation meter to config packages
* Adds basic tests
* Adds blueprint and templates_folder to the views.py
* Add configuration overrides
* Adds basic API structure and methods

Signed-off-by: Joao Goncalves <jsvgoncalves@gmail.com>
preservationmeter: Starting tests

* Adds record mocking to tests
* API now gets list of files using get_record(recid)

Signed-off-by: Joao Goncalves <jsvgoncalves@gmail.com>