ZmtDistributionPlugin.java: fixed imports and addition of 'deployZip' task

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

 package de.zmt.gradle;
 
 import org.gradle.api.*
+import org.gradle.api.file.DuplicatesStrategy
 
 /*
  * Distribution plugin for simulations based on zmt.core
@@ -32,7 +33,7 @@ public class ZmtDistributionPlugin implements Plugin<Project> {
             }
         }
 
-        task deployZip {
+        task('deployZip') {
             group = 'Upload'
             description = 'Uploads zip distribution to dochost.'
             dependsOn distZip, determineCredentials