Add a note explaining why to keep 'test_alt' rake task as well

Rakefile

@@ -44,6 +44,8 @@ task :test do
   end
 end
 
+# Alternate testing method, load all tests and run them at once 
+# Keep this because this test running method exposes test flaws sometimes not found with 'test'
 require 'rake/testtask'
 Rake::TestTask.new(:test_alt) do |test|
   test.libs << 'lib' << 'test'