Add support for decoding base64url variant. #16
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This is a common style of base64 which swaps out
+and/for URL/filename-safe equivalents.Incidentally, should there be some checks for invalid characters in the decode function? I was trying to use base64-arraybuffer on some keys that used this encoding style and it was producing incorrect but plausible-looking results without any kind of error, which led to a very frustrating debugging session.