debian installs libraries to /usr/lib/ruby/vendor_ruby as per debian policy. /usr/bin/cutest was not able to find cutest.rb file with current code. Change suggested by Lucas Nussbaum of debian-ruby team (I'm packaging cutest in debian).
make binary work when cutest.rb is not in ../lib
Changing the load path inside a library is not a good practice, so this doesn't work in the Ruby world. Sorry about that.