Generate "integration" module

Since Spring Roo 2.0.0.M2, developers are able to generate complete Spring Boot multimodule project using some simple commands.

Now a days, only the following modules are generated:

 <modules>
    <module>model</module>
    <module>repository</module>
    <module>service-api</module>
    <module>service-impl</module>
    <module>application</module>
  </modules>

This task has been created to include new "integration" module during multimodule project generation:

 <modules>
    <module>model</module>
    <module>repository</module>
    <module>integration</module>
    <module>service-api</module>
    <module>service-impl</module>
    <module>application</module>
  </modules>

Integration module will contain the necessary components to interact with external services. Service layer will delegate in this layer to connect with external services.

Also, use this task to reorder modules definition on parent pom.xml file. The definition order should be like the included above.