Use Rake's clobber task to remove rdoc/ and pkg/
Use Rake's clobber task to remove rdoc/ and pkg/

rdoc/task automatically clobbers the generated RDoc HTML files.

vjustov/sailthru-ruby-client,HannahLehman/sailthru-ruby-client,sailthru/sailthru-ruby-client,biegel/sailthru-ruby-client