Making jsio default logging level LOG

[Marcus Westin]

When running apps using js.io out of the box, there's a quite a bit of
js.io debug information dumped into the console. This information is
useful if you're debugging js.io, but not if you're building
applications on top of js.io.

I'm thinking of moving the default logger level in base.js from DEBUG
to LOG.

If no one objects, I'll go ahead and submit a patch in the coming
days.

Cheers!
Marcus