Remove a currently broken test.
Remove a currently broken test.

Something funny is going on here; I'm filing #41 to track it.

hadley/r-travis,qinwf/r-travis,eddelbuettel/r-travis,robzhu/r-travis,robzhu/r-travis,hadley/r-travis,craigcitro/r-travis,qinwf/r-travis,eddelbuettel/r-travis,craigcitro/r-travis