As of Spring 4, the GenericTypeResolver is more consistent in detecting raw types. It now returns null for both resolveTypeArguments(Set.class, Set.class) as well as resolveTypeArguments(Set.class, Iterable.class). The latter returns an array of Object.class in 3.x.
As this shouldn't make a pratical difference to actual clients (as they need to check for null anyway, we loosen the test case to be able to build Spring Data Commons against both Spring 3 and Spring 4.
Some polishing in the version detection in integration tests. Moved the Servlet 3.0 dependency into the Spring 4 profile.
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