Add setup doc
Add caution to README
Bump version 0.5.0
Add README for memcached
Add README for mysql
Add README for nginx
Merge branch 'master' into bump-version-0.5.0
Package php-apc
Rename plugin in relation to aws. Add 'aws-' prefix
Update plugin list
Merge pull request #36 from mackerelio/bump-version-0.5.0

Release version 0.5.0