ZmtDistributionPlugin.groovy: start script is added pointing to launcher

src/main/groovy/de/zmt/gradle/ZmtDistributionPlugin.groovy

@@ -13,12 +13,17 @@ import org.gradle.api.file.DuplicatesStrategy
  */
 public class ZmtDistributionPlugin implements Plugin<Project> {
     private static final def CONFIGURE = {
-        apply plugin: 'distribution'
+        apply plugin: 'application'
+        
+        mainClassName = "de.zmt.Main"
+        
+        startScripts {
+            applicationName = 'launcher'
+        }
 
         distributions {
             main {
                 contents {
-                    with (rootProject.distributions.main.contents)
                     into ('lib') {
                         // project's own library and dependencies
                         from (project.jar)
@@ -67,11 +72,7 @@ public class ZmtDistributionPlugin implements Plugin<Project> {
         }
         catch (org.gradle.process.internal.ExecException e) {
             println "git tag for ${project.name} failed. Cannot obtain version list."
-            output = new ByteArrayOutputStream()
-            exec {
-                commandLine 'git', 'rev-parse', '--short', 'HEAD'
-                standardOutput = output
-            }
+            return ''
         }
         return output.toString().trim()
     }