Added AWS CloudWatch output plugin - LOGSTASH-461
Removed unused imports
Merge branch 'master' of https://github.com/logstash/logstash
Added documentation comments - LOGSTASH-461
Merge branch 'master' of git://github.com/logstash/logstash
Updated cloudwatch output documentation comments
Merge remote-tracking branch 'remotes/logstash/master'
Merge remote-tracking branch 'remotes/logstash/master'
Merge remote-tracking branch 'remotes/logstash/master'
Merge branch 'master' into cloudwatch-docs
Merge remote-tracking branch 'remotes/logstash/master'
Merge branch 'master' into cloudwatch-docs
Updated cloudwatch output documentation comments
Added list of cloudwatch region's
Merge pull request #299 from semiosis/cloudwatch-docs

Cloudwatch docs