authentication and authorization

[robert-engel]

Simple implementation of auth features. Allows for the use of @Secured and @RequiredRoles annotations on resources in combination with an AuthHandler.

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[robert-engel]

@googlebot I signed it!

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[chtyim]

Thanks for your contribution. Overall looking good. Just couple trivial comments.

[robert-engel]

@chtyim I think i fixed everything.

[chtyim]

Just one minor comment. Please fix it and will get this merged. Thanks.