wro4j maven plugin append file content instead of replacing

Question

I have problem with wro4j plugin for maven. When I'm deploying application and plugin is executed to minimize and bundle my resource files it append new content to all.css and all.js files instead of replacing theirs content. It is quite troublesome if there is no cleanup done before it. I wonder, if it is possible to configure it somehow?

My config below:

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

    <error-page>
        <exception-type>org.springframework.security.web.authentication.rememberme.CookieTheftException</exception-type>
        <location>/login</location>
    </error-page>

    <filter>
        <filter-name>CorsFilter</filter-name>
        <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
        <init-param>
            <param-name>cors.allowed.origins</param-name>
            <param-value>*</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>CorsFilter</filter-name>
        <url-pattern>/resources/*</url-pattern>
   </filter-mapping>

</web-app>

wro.xml

<groups xmlns="http://www.isdc.ro/wro"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.isdc.ro/wro">
    <group name="all">
        <js>/resources/js/jquery*.js</js>
        <js>/resources/js/bootstrap.min.js</js>
        <js>/resources/js/bootstrap-*.js</js>
        <js>/resources/js/**.js</js>
        <css>/resources/css/bootstrap.min.css</css>
        <css>/resources/css/sunbasket-web.css</css>
        <css>/resources/css/bootstrap-*.css</css>
        <css>/resources/css/**.css</css>
   </group>
</groups>

pom.xml

<plugin>
    <groupId>ro.isdc.wro4j</groupId>
    <artifactId>wro4j-maven-plugin</artifactId>
    <version>1.8.0</version>
    <executions>
        <execution>
            <phase>compile</phase>
            <goals>
                <goal>run</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <targetGroups>all</targetGroups>
        <cssDestinationFolder>${project.basedir}/src/main/webapp/resources/css/</cssDestinationFolder>
        <jsDestinationFolder>${project.basedir}/src/main/webapp/resources/js/</jsDestinationFolder>          
        <contextFolder>${project.basedir}/src/main/webapp/</contextFolder>
        <wroFile>${project.basedir}/src/main/webapp/WEB-INF/wro.xml</wroFile>
        <extraConfigFile>${project.basedir}/src/main/resources/wro.properties</extraConfigFile>
        <ignoreMissingResources>false</ignoreMissingResources>
    </configuration>
</plugin>