Add sample code for Hub pattern
Minimize contention via simultaneuos timer execution and measure latency only for pushing from hub buffer to frontent
Changed buffering to stateless workers
Buffer grain is a stateless worker so there is no need to pin it via delaydeactivation
Add documentation for Hub pattern
Add readme for sample code
Update TOC and pattern description
Fix related patterns formatting
Fix info on Orleans version
Merge pull request #9 from yevhen/master

New design pattern: Hub