Remove the workaround for the bug when printing empty binaries in W mode

The fix for this was merged in R16 somewhere, so this workaround is no
longer needed, and fixes the EQC test from spotting the divergent
behaviour with io_lib.

See also: http://erlang.org/pipermail/erlang-patches/2012-September/003034.html
Fix test run on OSX
Force goldrush to version 0.1.6
Merge pull request #192 from basho/adt-fix-empty-binary-printing

Remove the workaround for the bug when printing empty binaries in W mode