Remove the coverage rake task

RCov does not work on Ruby 1.9.x

Rakefile

@@ -55,14 +55,6 @@ Rake::TestTask.new(:test) do |test|
   test.verbose = true
 end
 
-desc "Generate RCov test coverage and open in your browser"
-task :coverage do
-  require 'rcov'
-  sh "rm -fr coverage"
-  sh "rcov test/test_*.rb"
-  sh "open coverage/index.html"
-end
-
 require 'rdoc/task'
 Rake::RDocTask.new do |rdoc|
   rdoc.rdoc_dir = 'rdoc'