Fix issue #34

[ygnr]

Returns a string for address type from decodeSingle function.

[coveralls]

Coverage decreased (-1.5%) to 81.667% when pulling 98c6c18 on ygnr:master into 4a33f23 on ethereumjs:master.

[danjm]

Issue #34 was resolved by #57

Note the comment in that #57 (comment) which identifies the same problem as #34 and requests a unit test, which was subsequently added.

So this can be closed

[holgerd77]

Thanks @danjm, feel free to close yourself next time. Worst thing that can happen is that someone will reopen, and even that outcome will add some value to the thread since there is then some renewed expression interest in the thread. 👀🙂