Breaking change: Support for multiple config files

I have a need for multiple javascript apps in the same WAR module, so I had to change the configuration from
```xml
                        <configFile>${basedir}/src/main/webapp/plus/scripts/build.js</configFile>
```
```xml
                    <configFiles>
                        <configFile>${basedir}/src/main/webapp/plus/scripts/build.js</configFile>
                        <configFile>${basedir}/src/main/webapp/nomp/scripts/build.js</configFile>
                    </configFiles>
```