Fix the bug in AckProcessor.
Merge pull request #141 from EasonLiao/master

Fix the bug in AckProcessor.
Add flush operation.
Remove maven-site plugin.
Merge pull request #146 from EasonLiao/fix_maven

Remove maven-site plugin.
Merge pull request #142 from EasonLiao/add_sync

Add sync operation.
Use Semaphore to avoid the internal queues grow infinitely.
Merge pull request #144 from EasonLiao/limit_queue

Use Semaphore to avoid the internal queues grow infinitely.
Some cleanups on package name / organization name before first release.
Merge pull request #145 from EasonLiao/cleanups

Some cleanups need to be done before first release
Update README
Merge pull request #148 from EasonLiao/cleanups

Update README
Add plugins and metadata to pom.xml for releasing on OSSRH.
Merge pull request #149 from EasonLiao/ossrh

Add plugins and metadata to pom.xml for releasing on OSSRH.
Expose Ssl option to user.
Merge pull request #126 from EasonLiao/ssl

netty transport: add ssl suport