Add codecov.

Author: gsnedders

.travis.yml

@@ -26,8 +26,12 @@ install:
   - bash requirements-install.sh
 
 script:
-  - py.test
+  - coverage run --parallel-mode -m pytest
   - bash flake8-run.sh
 
 after_script:
   - python debug-info.py
+
+after_success:
+  - coverage combine
+  - codecov

requirements-install.sh

@@ -13,3 +13,5 @@ pip install -U -r requirements-test.txt
 if [[ $USE_OPTIONAL == "true" ]]; then
   pip install -U -r requirements-optional.txt
 fi
+
+pip install -U codecov