Expand Evaluation tests, use weighted values.
    
Added more test cases to EvaluationTest to test the other methods of
DenseWeightedEvaluation/UnweightedEvaluation.
    
Fixed a bug in DenseWeightedEvaluation.computeValue() where the the
weights were not applied to the return value.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1569361 13f79535-47bb-0310-9956-ffa450edef68
Fixed checkstyle and compiler warnings.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1569362 13f79535-47bb-0310-9956-ffa450edef68
Removed interfaces in the fluent API that do not add any value.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1569363 13f79535-47bb-0310-9956-ffa450edef68