class to hold information about resources

Should make this a delegate at some point, rather than doing it by hand.
start removing unnecessary attr_readers
start using Resources class in runner
remove unused function
add class to build histograms
define the inputs to histogram builder
define public api to histogram builder
find groups from runner.rb
move gnuplot information into histogram
find maximum values for a given group
basic method for scaling values
dump maximum values to temporary file for gnuplot
Fill in details for gnuplot templates

Returns array of strings, each meant to be passed into gnuplot to produce the png form of the histogram.
plumbing the refactoring of histogram creation