update postfix queue example
Different fixes for the S3 input and output plugins

- Input: Renaming the region config variable into region_endpoint to be inline with the output
- Input/Output: Making sure the endpoint urls are correct for all regions. ( based on PR #632 & #634 )
- Input/Output: added some extra logging info
Pathing has changed within the kibana project.

pathing to the dashboards has changed.
Merge pull request #471 from jlambert121/grok_doc_update

update postfix queue example
Merge #485 by hand
- hand-merge #485's test
add comment
Merge pull request #646 from electrical/makefile_fix_kibana

Pathing has changed within the kibana project.
Merge pull request #645 from electrical/s3_fixes

Different fixes for the S3 input and output plugins
- add CONTRIBUTING docs
- fix syntax
Merge git://github.com/logstash/logstash