Fix travis.

Author: Sarah Mount

.travis.yml

@@ -16,7 +16,7 @@ install:
 - cd $TRAVIS_BUILD_DIR
 - export PYTHONPATH=${PYTHONPATH}:${HOME}/pydgin/
 script:
-- py.test -n 4 -rxs --color=yes --cov-config .coveragerc --cov=revelation revelation/test/ scripts/test/
+- py.test -rxs --color=yes --cov-config .coveragerc --cov=revelation revelation/test/ scripts/test/
 - PYTHONPATH=${HOME}/pydgin/:. ${HOME}/pypy/rpython/bin/rpython --no-pdb --opt=jit revelation/sim.py
 - if [ "${TRAVIS_PULL_REQUEST}" == "false" ] && [ "${TRAVIS_BRANCH}" == "master" ] ;
     then PYTHONPATH=${HOME}/pydgin/:. ${HOME}/pypy/rpython/bin/rpython --no-pdb --opt=jit revelation/sim.py --debug ;