MAINT: add codecov for coverage report

Scipy, Pandas, scikit-image use codecov.

Use codecov as well as our current coveralls reporting.

Author: matthew-brett

.travis.yml

@@ -91,6 +91,7 @@ before_install:
     - if [ "${COVERAGE}" == "1" ]; then
       pip install coverage;
       pip install coveralls;
+      pip install codecov;
       fi
 # command to install dependencies
 install:
@@ -135,7 +136,7 @@ script:
           fi
       fi
 after_success:
-    - if [ "${COVERAGE}" == "1" ]; then coveralls; fi
+    - if [ "${COVERAGE}" == "1" ]; then coveralls; codecov; fi
 
 notifications:
     webhooks: http://nipy.bic.berkeley.edu:54856/travis