Change list items to =head2

This makes for a much better TOC on metacpan
Fix typo in docs
More doc fixups

The parser metacpan uses likes a blank line before code blocks
Fix docs for get() method
Merge branch 'manchicken-master'
updated changes, and version 0.006000
cheanged av_top_index to av_len as it's the same but works with older perls
Merge branch 'master' of https://github.com/maxmind/net-amqp-rabbitmq into maxmind-master
Merge branch 'maxmind-master'
version 0.006001
added manifest to dist, version 0.006002