Add release script and Javadoc html5 option

Author: tschuchortdev

build.gradle

@@ -54,8 +54,12 @@ allprojects {
     apply plugin: 'signing'
     apply plugin: 'maven-publish'
 
-    if (JavaVersion.current().isJava8Compatible()) {
-        tasks.withType(Javadoc) {
+    javadoc {
+        if(JavaVersion.current().isJava9Compatible()) {
+            options.addBooleanOption('html5', true)
+        }
+
+        if (JavaVersion.current().isJava8Compatible()) {
             options.addStringOption('Xdoclint:none', '-quiet')
         }
     }

release.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+./gradlew check --info &&
+./gradlew publish --info &&
+./gradlew closeAndReleaseRepository --info