Combine coverage reports from all test environments

Author: Andrey Fedoseev

circle.yml

@@ -18,6 +18,7 @@ dependencies:
 test:
   override:
     - flake8
+    - rm -f coverage.xml
     - tox
   post:
     - codecov

tox.ini

@@ -16,14 +16,11 @@ deps =
     watchdog
     libsass
     coverage==3.7.1
-    pytest-cov==2.1.0
+    pytest-cov==2.2.1
     django16: Django>=1.6,<1.7
     django17: Django>=1.7,<1.8
     django18: Django>=1.8,<1.9
     django19: Django==1.9.1
-commands = py.test static_precompiler
+commands = py.test static_precompiler --cov static_precompiler --cov-report xml --cov-append
 setenv =
     PYTHONPATH = {toxinidir}
-
-[testenv:py27-django19]
-commands = py.test static_precompiler --cov static_precompiler --cov-report xml