fix osx build (#112)

Author: gijzelaerr

.travis/before_install.sh

@@ -3,7 +3,9 @@
 set -x
 
 if [ "$TRAVIS_OS_NAME" = "osx" ]; then
-    brew install snap7 python3
+    brew install snap7
+    pip install nose mock coverage
+    pip3 install nose mock coverage
 fi
 
 if [ "$TRAVIS_OS_NAME" = "linux" ]; then

.travis/script.sh

@@ -5,11 +5,12 @@ set -x
 if [ "$TRAVIS_OS_NAME" = "linux" ]; then
     NOSETESTS=${VIRTUAL_ENV}/bin/nosetests
 else
-    NOSETESTS=/usr/local/bin/nosetests
+    NOSETESTS="python -m nose"
 fi
 
+PYTHONPATH=.
+
+${NOSETESTS} --with-coverage test/test_server.py
+${NOSETESTS} --with-coverage test/test_client.py
+${NOSETESTS} --with-coverage test/test_util.py
 sudo ${NOSETESTS} --with-coverage test/test_partner.py
-sudo chown travis .coverage
-nosetests --with-coverage test/test_server.py
-nosetests --with-coverage test/test_client.py
-nosetests --with-coverage test/test_util.py