supports ruby 1.9+

Old versions of ruby (pre 1.9) added the current directory to the $LOAD_PATH, however new versions of ruby (1.9+) do not. Starting with modern ruby versions 1.9 and greater (including OSX Mavericks, which uses ruby 2.0 for /usr/bin/ruby), the scripts will no longer work correctly, do to this issue. 
This pull request fixes that problem, by using the require_relative method to load the helpers.rb file.