Changed: add possibility to override authorize function

[treussart]

Merge Request to allow the possibility of being able to override the 'authorize' method. This allows you to change the business logic on user authentication.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.83%. Comparing base (51bf962) to head (115eb8e).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #25 +/- ## ======================================= Coverage 79.83% 79.83% ======================================= Files 1 1 Lines 119 119 ======================================= Hits 95 95 Misses 13 13 Partials 11 11 ```

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