Speed up AbstractConnection::prepare_content() with circular buffer.
Speed up both AMQPChannel::basic_publish() and publish_batch() with a
common circular buffer.
Update README.md

change version in composer.json example
Merge pull request #114 from eclips16/patch-1

Update README.md
[minor][pull-request] Restore previous .gitignore version and remove
typo extra space.
Merge pull request #113 from Hi-Media/optimization

Optimization for basic_publish
bumps version for composer