Clean npm folders in build.

Author: uhafner

pom.xml

@@ -49,6 +49,20 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-clean-plugin</artifactId>
+        <configuration>
+          <filesets>
+            <fileset>
+              <directory>node</directory>
+            </fileset>
+            <fileset>
+              <directory>node_modules</directory>
+            </fileset>
+          </filesets>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>com.github.eirslett</groupId>
         <artifactId>frontend-maven-plugin</artifactId>