Add usersAuthorities to /users

[MatiasMercado]

Authorities

User's authorities can now be accessed in /users.
This will return a list containing both the action available and it's location.

Trello Card

https://trello.com/c/ZfO06JhK/23-send-user-authorities

[codecov-io]

Current coverage is 11.64% (diff: 0.00%)

Merging #61 into development will decrease coverage by 0.12%

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  Hits               305        305          
- Misses            2286       2314    +28   
  Partials             0          0          

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[gibarsin]

Code looks ok.
The "ROLE_" prefix can be spared, because it was added every time the authorities were obtained.
The authoritiesMap should go to another class, maybe a wrapper class or a table (inclined more to a wrapper)