Fix running flake on travis

Author: sloria

.travis.yml

@@ -10,6 +10,7 @@ before_install:
   - tar -xzvf nltk_data-0.11.0.tar.gz -C ~
 install:
   - pip install numpy
+  - pip install -r dev-requirements.txt
   - pip install -U six
   - pip install -U .
   - if [[ $TRAVIS_PYTHON_VERSION == '3.4' ]]; then pip install -r docs/requirements.txt;

run_tests.py

@@ -25,7 +25,7 @@
 
 def main():
     args = get_argv()
-    retcode = subprocess.call(['flake8', 'textblob'])
+    retcode = subprocess.call(['flake8', 'textblob'], shell=True)
     if retcode:
         sys.exit(1)
     success = nose.run(argv=args)