SPARK-1935: Explicitly add commons-codec 1.5 as a dependency (for branch-0.9).

This is for branch 0.9.

Author: Yin Huai <huai@cse.ohio-state.edu>

Closes #912 from yhuai/SPARK-1935-branch-0.9 and squashes the following commits:

d7f0f7c [Yin Huai] Explicitly add commons-codec 1.5 as a dependency.