Fix Rakefile to use Rspec

Rakefile

@@ -25,14 +25,18 @@ Jeweler::Tasks.new do |gem|
 end
 Jeweler::RubygemsDotOrgTasks.new
 
-require 'rake/testtask'
-Rake::TestTask.new(:test) do |test|
-  test.libs << 'lib' << 'test'
-  test.pattern = 'test/**/test_*.rb'
-  test.verbose = true
+require 'rspec/core'
+require 'rspec/core/rake_task'
+RSpec::Core::RakeTask.new(:spec) do |spec|
+  spec.pattern = FileList['spec/**/*_spec.rb']
 end
 
-task :default => :test
+RSpec::Core::RakeTask.new(:rcov) do |spec|
+  spec.pattern = 'spec/**/*_spec.rb'
+  spec.rcov = true
+end
+
+task :default => :spec
 
 require 'rdoc/task'
 Rake::RDocTask.new do |rdoc|