Replace coveralls with codecov

Replacing badge TBD when url is known

.travis.yml

@@ -16,7 +16,7 @@ script:
 
 after_success:
   - coveralls
-  - if [ "$TRAVIS_BRANCH" == "master" ]; then
+  - if [ "$TRAVIS_BRANCH" == "master" -o  "$TRAVIS_EVENT_TYPE" == "pull_request" ]; then
         bash <(curl -s https://codecov.io/bash) -cF python;
     fi
   - if [ "$TRAVIS_TAG" ]; then

codecov.yml

+coverage:
+  precision: 2
+  round: down
+  range: "70...100" # range for red-green gradient in visualizations
+
+  status:
+    project: no
+    patch:
+      default:
+        enabled: yes
+        # basic
+        target: 100%  # we always want 100% coverage for new code
+        threshold: null
+        base: pr 
+    changes:
+      default:
+        enabled: yes
+        # basic
+        base: pr 
+comment:
+  layout: "diff"
+  behavior: default
+  require_changes: false  # if true: only post the comment if coverage changes
+  require_base: no        # [yes :: must have a base report to post]
+  require_head: yes       # [yes :: must have a head report to post]
+  branches: null

test/integration_tests/requirements-integration-test.txt

 attrdict==2.0.0
 coverage==4.0.3
-coveralls==1.1
 mock==2.0.0
 mongomock==3.8.0
 newrelic==2.60.0.46