Enabled maven-failsafe-plugin in travis.
language: java
jdk: oraclejdk8
install : true
-script : mvn -B -V clean verify jacoco:prepare-agent test jacoco:report
+script : mvn -B -V clean verify jacoco:prepare-agent test failsafe:integration-test jacoco:report
after_success:
- bash <(curl -s https://codecov.io/bash)
