@Override should not change method signature

[kkriske]

when subclassing DefaultPluginManager you are forced to create a CompoundPluginDescriptorFinder even if you only need one

[coveralls]

Coverage decreased (-0.02%) to 56.957% when pulling a1e36b3 on kkriske:patch-1 into 468abf3 on decebals:master.

[decebals]

Initial, my intention was to change the return value for all methods that return internally a Compound class implementation. The idea was to avoid a cast in subclass. The construction is OK from Java point of view.
In the end I think that it's good to preserve the original method signature without to alter the return value.

[decebals]

Thanks!