To define threadPoolProperties from @HystrixCommand annotation
Added an example of threadPoolProperties usage into README
Use ConfigurationManager to initialize ThreadPoolProperties instead of passing ThreadPoolPropertiesSetter into the constructor
refactor, and added test case for verifying the thread pool properties. problem: metricsRollingStatisticalWindowInMilliseconds, and metricsRollingStatisticalWindowBuckets wouldn't be set correctly
added test case for setting metrics.rollingStats; updated README; removed unused code
Merge pull request #326 from yuhanz/master

Added supports for setting threadPoolProperties through @HystrixCommand annotation