Rename integration test to match idiomatic test naming

Author: dalehamel

Rakefile

@@ -6,7 +6,7 @@ require "rake/testtask"
 Rake::TestTask.new(:test) do |t|
   t.libs << "test"
   t.libs << "lib"
-  t.test_files = FileList["test/**/test_*.rb", "test/integration_test.rb"]
+  t.test_files = FileList["test/**/test_*.rb"]
 end
 
 task :console => :compile do