Fixed flask app initialization for Travis CI

{{cookiecutter.app_name}}/.travis.yml

 # Config file for automatic testing at travis-ci.org
 sudo: false  # http://docs.travis-ci.com/user/migrating-from-legacy/
 language: python
+env:
+- FLASK_APP=autoapp.py FLASK_DEBUG=1
 python:
   - 2.7
   - 3.4