Attempt coveralls integration.

Likely totally broken.

.travis.yml

@@ -7,4 +7,5 @@ python:
   - "3.4"
   - "3.5"
 
-script: python setup.py test
+script: python setup.py test --cov metrik
+after_success: coveralls

setup.py

@@ -15,6 +15,7 @@ setup(
         'pytest_runner'
     ],
     tests_require=[
-        'pytest'
+        'pytest',
+        'python-coveralls'
     ]
 )