#142, #137 - CurieProvider can now return multiple curies.

Changed `getCurieInformation(…)` to receive a `Links` instance with the previously added links and is forced to return a collection of curies so that multiple ones can be resolved transparently.

Made Curie value class protected to be able to reuse it from extensions of DefaultCurieProvider. Switched to the custom HATEOAS UriTemplate instance instead of the standard Spring MVC one.

Polished JavaDoc of DefaultCurieProvider. Removed some of the deprecation warnings that were introduced by the upgrade to Jackson 2.3. Polished (read: reactivated) some test cases and slightly changed the internals of UriTemplate works. Added TemplateVariables.asList().
#137 - Improved Link and UriTemplate API.

Added constructor to Link to take a UriTemplate. Added constructor to UriTemplate to take a base URI and TemplateVariables.