Autoloads by default, but makes it easy to disable.
don't require things twice now that autoload is default.

removes require lines added by some jackass in
d0437a1cb42f74b865bcf5fa6111d77b72a88688
autoload instrumentation too
Merge pull request #312 from lostisland/autoload-by-default

Autoloads by default, but makes it easy to disable.