using maven aether for plugin installation

scm-core/src/main/java/sonia/scm/plugin/Plugin.java

@@ -35,8 +35,6 @@ package sonia.scm.plugin;
 
 //~--- JDK imports ------------------------------------------------------------
 
-import java.net.URL;
-
 import java.util.Set;
 
 import javax.xml.bind.annotation.XmlAccessType;

scm-core/src/main/java/sonia/scm/plugin/PluginInformation.java

@@ -89,6 +89,21 @@ public class PluginInformation
     return groupId;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  public String getId()
+  {
+    StringBuilder id = new StringBuilder(groupId);
+
+    id.append(":").append(artifactId).append(":");
+
+    return id.append(version).toString();
+  }
+
   /**
    * Method description
    *