Added rubocop to rakefile

Rakefile

@@ -1,5 +1,6 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
+require 'rubocop/rake_task'
 
 task :default => :test
 Rake::TestTask.new do |t|
@@ -58,3 +59,12 @@ task :reset_statistics do
   puts "The mean time reporter statistics have been reset."
   exit 0
 end
+
+desc 'Run RuboCop on the lib directory'
+RuboCop::RakeTask.new(:rubocop) do |task|
+  task.patterns = ['lib/**/*.rb']
+  # only show the files with failures
+  task.formatters = ['clang']
+  # don't abort rake on failure
+  task.fail_on_error = false
+end

minitest-reporters.gemspec

@@ -23,6 +23,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'maruku'
   s.add_development_dependency 'rake'
+  s.add_development_dependency 'rubocop'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")