Added safety checker in travis so that bugs such as #3 can be detected directly in continuous integration.

Author: smarie

.travis.yml

@@ -41,6 +41,7 @@ script:
 #  - coverage run tests.py
   - python ./code_generation/mini_lambda_methods_generation.py
   - pip install .
+  - python -c "import os; os.chdir('..'); import mini_lambda"
 
 after_success:
 # ***tests***