Added connection creation timer. Use static ScheduledThreadPoolExecutor for all DynamicServerListLoadBalancer instances with configurable core thread pool size.
Added Junit test for DynamicServerListLoadBalancer
Make timer more accurate.
Merge pull request #77 from allenxwang/cp

Added connection creation timer. Use static ScheduledThreadPoolExecutor for all DynamicServerListLoadBalancer instances with configurable core thread pool size.