Fix some issues in travis and setup.py

Author: chdemko

.travis.yml

@@ -9,7 +9,7 @@ before_install:
   - pip install --user --upgrade pip
 install:
   - pip install --user coveralls
-  - pip install --user tox
+  - pip install --user -e .[test]
 script:
   - tox
   - coverage report -m

setup.py

@@ -106,12 +106,12 @@
     # $ pip install -e .[dev,test]
     extras_require={
         'dev': ['check-manifest'],
-        'test': ['coverage'],
+        'test': ['tox'],
     },
 
     # packages=find_packages(),
     # include_package_data = True,
 
     setup_requires=['pytest-runner'],
-    tests_require=['pytest', 'coverage'],
+    tests_require=['pytest'],
 )