Avoid invalid merge when metadata update fails
Use ohai populated ec2 userdata
Install agent config in conf.d

This will allow each plugin to have it's own config file to aid with
easy installation and removal without having to manage the agent config
at the same time.
Quoting style
Expose sd-agent service for notifications
Always have a plugins directory

Also take responsibility for creating it.
Plugin LWRP
Plugin documentation
Symlink documented config location to new location
Add notice to config about location of plugin settings
Update config file links and organise
Add provider merging support for AWS
Merge pull request #9 from mal/plugins

Plugin LWRP & Other Fun Things