base32
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added optional checksum
Added optional checksum, as described in http://www.crockford.com/wrmg/base32.html.
+1 for checksums to be supported in this library. I just took a look at this PR and my main quibble is that it should be possible to differentiate between invalid checksum errors and other types of error – since for example one may wish to show users more helpful error messages in this case.