review patch - adding verbose output to startup

Hello, I attached a patch to this ticket:

It shows verbose output of what rails is doing during startup. Shows
each step and how long it look, including every gem and plugin. But
only if the env var RAILS_VERBOSE_STARTUP is set to true.

I using it now on my local system and typing script/console or running
a test is no longer a mystery 30 second wait.

In the future I'd like to be able to turn off certain gems/routes/
plugins etc when running certain tests. I want to run the test over
and over, but gotta get the load time down.

Appreciate any feedback on the patch. Thanks.