Switch to newer Code Climiate reporting

See https://github.com/codeclimate/ruby-test-reporter/blob/master/README.md#upgrading-from-pre-10-versions for details.

Gemfile

@@ -8,4 +8,5 @@ group :development do
   gem 'travis', '>= 1.8.2'
   gem 'jeweler', '>=2.0.1'
   gem 'codeclimate-test-reporter'
+  gem 'simplecov'
 end

test/test_helper.rb

 require 'rubygems'
 require 'minitest/autorun'
-require "codeclimate-test-reporter"
-CodeClimate::TestReporter.start
+require 'simplecov'
+SimpleCov.start
 
 $LOAD_PATH.unshift(File.dirname(__FILE__))
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))