Fix #71: Count aggregator includes other aggregated values. 
http://github.com/mysticfall/pivot4j/issues/issue/71
Change default theme to 'Redmond'.
Performance optimization(especially when using aggregations).
Fix #72: Some calculated values missing with a hierarchy aggregator.
http://github.com/mysticfall/pivot4j/issues/issue/72

Fix aggregation problems with various corner cases.
Fix #72: Some calculated values missing with a hierarchy aggregator. 
http://github.com/mysticfall/pivot4j/issues/issue/72
#72: Additional unit tests for corner cases.
http://github.com/mysticfall/pivot4j/issues/issue/72