Remove Rake task for generating test coverage stats with RCov
Remove Rake task for generating test coverage stats with RCov

RCov does not work on Ruby 1.9, better to use a service as <https://codeclimate.com> anyway.

1776/tire,ChapterMedia/tire,brijeshgpt7/retire,tklee/tire_shiphawk,Telmate/tire,rubydubee/retire,HenleyChiu/tire,mavenlink/retire,zaharpecherin/retire,dbose/retire,doximity/tire,elbuo8/retire,fabn/retire,iamrahulroy/retire,karmi/retire,alphagov/tire