IE6 support, and ES5 assumptions

I don't know if compatibility is a target of these browserify modules … but currently, IE6 bugs out with “Object doesn't support this property or method.”

This is coming, at the very least, from calls to `.isArray()`, which is ES5, and not available in IE6. There's probably other ES5 / IE6 bugs, as well. I can probably clean these up for you, *if* backwards-compatibility is something you're willing to sign-on for and maintain? (Also, same question applies to other Browserify projects.)

It will most likely require including some ES5 shims, which will add weight to everything …