Patch to work with Ruby 1.9.x
Patch to work with Ruby 1.9.x

Signed-off-by: Dan Swain <c5cbeabd52d17dc2a218e6ecab0da7fa7e5c56b0@princeton.edu>

dantswain/rhubarb,dantswain/rhubarb,dantswain/rhubarb,dantswain/rhubarb