Changed project version from 1.0-SNAPSHOT to 0.1-SNAPSHOT
Refactored metrics aggregation mechanics
 -DataAggregator has its own thread which aggregates raw data
 -min, avg, max, percentiles calculation extracted to a separate class. Now when those stats need to be calculated client code has to provide extension of MetricExtractor class
 -added UnitTests for data aggregation and report data generation
The refactoring allows to expose thread pool statistics to the reports. That was done for discarded requests which closes #6.