Set BOB_PREFIX_PATH in travis config

.travis.yml

@@ -23,6 +23,6 @@ install:
 - python bootstrap-buildout.py
 - CPPFLAGS=--coverage LDFLAGS=--coverage ./bin/buildout buildout:debug=false
 script:
-- ./bin/coverage run --source=bob.example.cmake ./bin/nosetests -sv
+- BOB_PREFIX_PATH="/home/travis/virtualenv/python*/" ./bin/coverage run --source=bob.example.cmake ./bin/nosetests -sv
 after_success:
 - cpp-coveralls --build-root=`pwd` --exclude=src