like go test, but faster

[Nate Finch]

Russ Cox has an experimental command called gt, which replaces the go test
tool, and caches test output when you run it.  The next time you run gt, if
none of the files in a package have changed and none of the files of
packages it depends on have changed, then gt will just reprint the cached
output.

You can install it with a simple go get rsc.io/gt.  Right not it seems like
it doesn't work with -race or -cover, but for running the full test suite
it's pretty amazing.

-Nate
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