simplifies the rakefile

Rakefile

@@ -1,16 +1,12 @@
-require "bundler"
-Bundler::GemHelper.install_tasks
-
-require "rspec/core/rake_task"
+require "bundler/gem_tasks"
 
 desc "Benchmark Nori parsers"
 task :benchmark do
   require "benchmark/benchmark"
 end
 
-RSpec::Core::RakeTask.new do |t|
-  t.rspec_opts = %w(-c)
-end
+require "rspec/core/rake_task"
+RSpec::Core::RakeTask.new
 
 task :default => :spec
 task :test => :spec