Create fake version.py on Travis-CI

Author: ddemidov

.travis.yml

@@ -5,7 +5,8 @@ sudo: false
 install:
 - pip install PIL --allow-external PIL --allow-unverified PIL
 script:
-- "./tests/api_tests.py"
+- echo "__version__=''" > ev3dev/version.py
+- ./tests/api_tests.py
 deploy:
   provider: pypi
   user: Denis.Demidov