Make sure test_helper is loaded first when running tests, so coverage report is accurate

Author: fbacall

Rakefile

@@ -7,6 +7,7 @@ Rake::TestTask.new(:test) do |t|
   t.libs << 'test'
   t.pattern = 'test/**/*_test.rb'
   t.verbose = true
+  t.ruby_opts = ['-r "./test/test_helper"']
 end
 
 task :console do