Basic Container Item Annotation Support

[CarstenWickner]

These changes should cover the majority of use-cases as per #60 for container items.

This is explicitly not covering other generics such as Optional<@NotBlank String>.
Also for collections, this "basic" support is only going "one level deep", i.e.

• List<@Size(min = 3) String> will now pick-up the "minLength" for the String list items
• List<List<@Size(min = 3) String>> will not recognize the "minLength" attributes

Since the classmate library used for type resolution currently does not include the AnnotatedType (introduced in Java 8), some additional changes will be required to make this work for more than the first level of container items.
At that time, a more generic approach can be taken to support other parameterized types besides collections.

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jsonschema-generator

Added

• Convenience methods on FieldScope/MethodScope for accessing (first level) container item annotations: getContainerItemAnnotation() and getContainerItemAnnotationConsideringFieldAndGetter()

Changed

• MethodScope.getAnnotation() now also considers annotations directly on return type (when no matching annotation was found on the method itself)

jsonschema-module-javax-validation

Changed

• Consider (first level) container item annotations (e.g. List<@Size(min = 3) String>)