Added support for high resolution time/interval (collectd 5.0), and also added support for derive and absolute types
Changed naming of plugin_instance and type_instance to plugin-instance and type-instance to match official collectd write_graphite plugin
Modified collectd pack in accordance to proper naming aswell
Merge pull request #794 from anonimoose/master

Collectd 5.0 support for high resolution time, and derive/absolute types