[TravisCI] Run the unittests in TravisCI. Not sure why they weren't being run before.
[TravisCI] Run the unittests in TravisCI. Not sure why they weren't
being run before.

SRI-CSL/whole-program-llvm,travitch/whole-program-llvm,SRI-CSL/whole-program-llvm,SRI-CSL/whole-program-llvm,SRI-CSL/whole-program-llvm,travitch/whole-program-llvm,travitch/whole-program-llvm,SRI-CSL/whole-program-llvm,travitch/whole-program-llvm