feat(tests): use codecov.io for visual code coverage reporting

See https://codecov.io/github/deis/workflow

Closes #442

Author: helgi

.travis.yml

@@ -19,6 +19,8 @@ install:
   - pip install -r rootfs/dev_requirements.txt
 script:
   - make test
+after_success:
+  - cd rootfs/ && codecov
 deploy:
   - provider: script
     # ensure client/doc builds aren't removed

README.md

@@ -1,6 +1,6 @@
 # Deis Workflow v2
 
-[![Build Status](https://travis-ci.org/deis/workflow.svg?branch=master)](https://travis-ci.org/deis/workflow) [![Go Report Card](http://goreportcard.com/badge/deis/workflow)](http://goreportcard.com/report/deis/workflow)
+[![Build Status](https://travis-ci.org/deis/workflow.svg?branch=master)](https://travis-ci.org/deis/workflow) [![codecov.io](https://codecov.io/github/deis/workflow/coverage.svg?branch=master)](https://codecov.io/github/deis/workflow?branch=master)
 
 Deis (pronounced DAY-iss) is an open source PaaS that makes it easy to deploy and manage
 applications on your own servers. Deis builds on [Kubernetes](http://kubernetes.io/) to provide

rootfs/dev_requirements.txt

@@ -3,3 +3,6 @@ coverage==4.0.3
 
 # Run "make flake8" to check python syntax and style
 flake8==2.5.4
+
+# code coverage report at https://codecov.io/github/deis/workflow
+codecov==1.6.3