force zip_safe and consolidate travis requirements

.travis.yml

@@ -11,9 +11,7 @@ matrix:
   allow_failures:
     - python: nightly
 install:
-    - pip install flake8
-    - pip install tox-travis
-    - pip install coveralls
+    - pip install -r requirements_dev.txt
 before_script:
     flake8 .
 script:

requirements_dev.txt

@@ -0,0 +1,3 @@
+flake8
+tox-travis
+coveralls

setup.py

@@ -173,4 +173,5 @@ setup(
         'Topic :: System :: Software Distribution',
         'Topic :: System :: Systems Administration',
     ],
+    zip_safe=False
 )