Update to Maven Central

Replace jcenter() with mavenCentral() in gradle/repositories.gradle

assigned to @jaltekruse

changed milestone to %nshmp-haz 2.0 II

added To Do label

mentioned in merge request !75 (merged)

added In Progress label and removed To Do label

mentioned in commit 42613d95

closed with merge request !75 (merged)

removed In Progress label