Require base64-arraybuffer module conditionally. #58
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Since base64-arraybuffer version 0.1.5 introduced a change that fails at require time in a browser without ArrayBuffer support, the require must be guarded.
I verified that the existing tests fail on IE 8 once base64-arraybuffer is at 0.1.5 and that they no longer fail after the patch. This ought to help resolve socketio/engine.io#407.