Converted root package to main package

[deneonet]

#162

[matheusd]

This currently loses the ability to use the -benchtime flag, which means

1- CI runs will take much longer now (because we can't reduce the bench time target)
2- No way to improve accuracy by increasing the bench time target

I don't think there's a way to internally reach out to modify the benchtime arg (unless there's a very clever way) so I'd suggest still allowing running the benchmarks via go test, at least to improve the CI situation.

[deneonet]

Should be good now.