travis-CI tests are broken due to changes in travis-CI, again

[jfoote]

exploitable/tests/bin/testUncategorizedSignal.test
Traceback (most recent call last):
  File "/home/travis/build/jfoote/exploitable/exploitable/exploitable.py", line 92, in <module>
    import lib.arch as arch
  File "/home/travis/build/jfoote/exploitable/exploitable/lib/arch.py", line 41, in <module>
    from lib.gdb_wrapper.arm import ArmTarget
  File "/home/travis/build/jfoote/exploitable/exploitable/lib/gdb_wrapper/arm.py", line 71, in <module>
    from lib.gdb_wrapper.x86 import Target, Operand, Instruction
  File "/home/travis/build/jfoote/exploitable/exploitable/lib/gdb_wrapper/x86.py", line 59, in <module>
    import hashlib
  File "/opt/python/2.7.9/lib/python2.7/hashlib.py", line 138, in <module>
    _hashlib.openssl_md_meth_names)

Should probably wait a few days to see if this fixes itself. It could be a latent issue in my logic, or something I have no control over. Note that hashlib is used to generate backtrace hashes.