Use assembly plugin 2.4, add missing ID.

guacamole-common-js/pom.xml

@@ -18,7 +18,9 @@
         <plugins>
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
+                <version>2.4</version>
                 <configuration>
+                    <appendAssemblyId>false</appendAssemblyId>
                     <descriptors>
                         <descriptor>static.xml</descriptor>
                     </descriptors>

guacamole-common-js/static.xml

@@ -1,5 +1,6 @@
 <assembly>
     <baseDirectory>guacamole-common-js</baseDirectory>
+    <id>guacamole-common-js</id>
     <formats>
         <format>zip</format>
     </formats>