Generally polished implementation and test cases for Greg's contribution.
Re-ordered parameters in ControllerUtils' helper methods for consistency.
Use Spring's CollectionFactory to create a suitable collection for the handled properties in the first place to avoid unnecessary conversion later on.
Removed duplication in test cases. Polished JavaDoc in UriListHttpMessageConverter and moved to a Scanner based implementation to read the request body.
Adapted to latest changes in Spring HATEOAS. Reactivated ResourceStringUtilsTests.
Related pull requests: #128, #86.
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