Fix typo
Add option to plot data as a percentage

Using pl/r for matrix arithmetic.
Update Vagrant config

Also install pl/R packages.
Add more WUI items to ignore
Add postgresql examples to vm collectd config
Merge https://github.com/mwongatemma/yams

Conflicts:
	vm/provision.sh
Use double precision over numeric

The data from collectd are 8 byte doubles.
Add unpublished paper

This paper was submitted to Lisa 2011 (Boston) but was not selected for
publication.  This work will be saved here in order to keep sharing
information.