Implemented dynamic sector skill groups rendering

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Implemented RegistrationService (unfinished)

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- Domain logic mostly done. Data layer dependency makes
implementation harder after this point. This is a good point
to stop and wait for JPA repositories and hierharchies.

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Session and security activated.

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- Basic registration implemented
- Basic login implemented
- Sessions activated

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Merge pull request #31 from kabexnuf/uc2-register

Registration view and service layer implementation