uses the right virtualenv path

.travis.yml

   - "cd tracim && python setup.py develop; cd -"
   - "pip install -r install/requirements.txt; echo"
   - "pip install -r install/requirements.txt; echo"
-  - "./bin/tg2env-patch /home/travis/virtualenv"
+  - "./bin/tg2env-patch /home/travis/virtualenv/python3.2.5"
   
 before_script:
   - "psql -c 'create database tracim_test;' -U postgres"