add BlackholeBlockingQueueSport
add a warnning log if message fetching cannot catch up with actually using
Merge pull request #1 from LantaoJin/master

add BlackholeBlockingQueueSport
change version to 1.1-SNAPSHOT
rebuild
bugfix: open a thread
extract fetcher for spout
Merge pull request #3 from LantaoJin/master

Refactor and update version, code review by Xinchun.Wang
change version to 1.2-SNAPSHOT
Merge pull request #4 from LantaoJin/master

change version to 1.2-SNAPSHOT
extract fetcher for spout
merge conflict