Add support for CI integration

[Farigh]

• Add JUnit report generation

Most CI support JUnit report parsing :

• TeamCity: https://www.jetbrains.com/help/teamcity/xml-report-processing.html
• GitLab-CI: https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportsjunit

JUnit schema : https://github.com/windyroad/JUnit-Schema/blob/master/JUnit.xsd

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Some CI environment supports custom build status:

• TeamCity : https://www.jetbrains.com/help/teamcity/build-script-interaction-with-teamcity.html#BuildScriptInteractionwithTeamCity-ReportingBuildStatus

Some might come in the futur:

• GitHub : https://developer.github.com/v3/repos/statuses/ ?
  https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjobs_idoutputs

[Farigh]

Not yet possible for Github : https://github.community/t/is-there-any-way-to-update-a-job-name-or-status-from-within-a-step/18404/2#M10410

[Farigh]

Since GitLab 11.2, JUnit output is supported by Gitlab : https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportsjunit