Use with java 8 and enforce notification on specific branch

[yannicksiewe]

• Support for java 8
• Allow users to specify a specific branch for notification (Entreprise Edition)

[sleroy]

Before rolling back to Java 8, please confirm that this version works with the latest Sonarqube version.

I can't maintain two different train of releases.

Thank you.

[yannicksiewe]

My case, it works with:

• Sonarqube version 8.1 (Entreprise Edition)
• Java 8 I can also confirm that it works with Sonarqube version 7.1