#114 Comments not represented correctly in metrics download

[elmugrat]

When downloading metrics for a project, the comments are not divided into their categories. I.E if "Status" and "Type" are enabled in codestriker.conf, the metrics.csv file will have metrics for "Status" and "Type", not the subcategories "Completed", "Invalid", "Minor", "Style", etc. It appears that the code in lib/Codestriker/Model/MetricStats.pm needs to get the data from 1 level deeper in the commentstatemetric table.