BF fix that rails stats and rails_best_practices reports weren't being generated
BF upgrading to better version of rails_best_practices, specify it on the cli
BF slightly clarify ruby_parser failures
BF add gemnasium gem dependencies badge
BF metric_fu-roodi can now be installed from rubygems
BF updating to latest churn, specify ruby_parser holdback
BF move general metrics running code out of rake and into its own class
BF bump to 2.1.3.6, remove rake dependency on executable