Fixes travis script

.travis.yml

   - cat install/requirements.postgresql.txt >> install/requirements.txt; echo
   - cat install/requirements.mysql.txt >> install/requirements.txt; echo
   - pip install -r install/requirements.txt; echo
+  - cd tracim && python setup.py compile_catalog && cd -
 
 before_script:
   - cp ${TRAVIS_BUILD_DIR}/tracim/development.ini.base ${TRAVIS_BUILD_DIR}/tracim/development.ini