Default to config options to empty if no cookie set.

I was getting errors in my app because on some pages I have my bundle included but without the cookie set. That's probably indicative of a design issue in my app, but it doesn't seem crazy to me to just default the config to empty if no cookie is set. What do you think?

I had to update the .jshintignore too to not lint the bundled file, as the browserify output doesn't seem to be compatible with the linter. Hope that's okay.

Have bumped the version for you too, so if you're happy you should just be able to merge/pull/publish. But can remove it from the commit if you'd rather :smile: