Given a ruby file, map the klass and methods to a range of line numbers The klass and method to line numbers mappings, are stored in @klasses_collection and @methods_collection this is based off github.com/seattlerb/ruby_parser which seems to have some known line number bugs perhaps look at and move more to the style of line numbers from metric_fu github.com/metricfu/metric_fu/blob/master/lib/data_structures/line_numbers.rb