Add SlicedResourcesAssembler for web integration.

[mschout]

Added SlicedResourcesAssembler to esaily convert Slice instances into SlicedResource instances and automatically build the required previous/next link based on PageableHandlerMethodArgumentResolver present in the MVC configuration. The assembler can either be injected into a Spring MVC controller or a controller method. The latter will then assume the controller methods URI to be used as pagination link base.

Added necessary SlicedResourcesAssemblerArgumentResolver and MethodParameterAwareSlicedResourcesAssembler classes and wire up HateoasAwareSpringDataWebConfiguration configuration beans to that SlicedResourcesAssembler's can be auto-injected into controllers.

Closes #1307

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[mschout]

NOTE: this depends on spring-projects/spring-hateoas#1856 which adds SlicedModel, so this one could not possibly be merged until the spring-hateoas change gets done.

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[odrotbohm]

This has been polished and merged. Thanks again, @mschout, for the contribution!