introduce more browser compatible implementations of core modules

[michaelficarra]

While modules like util and path work in most browsers, they require ES5. Alternative implementations that work in more environments are distributed in https://github.com/alexgorbatchev/node-browser-builtins/tree/master/builtin

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[michaelficarra]

After further research, I've discovered that these implementations do not seem to be much more compatible with old environments. A better source is needed.