* Add license & license_file DSL methods to software.
  * license (String): Sets the license of the software component.
  * license_file (String): The relative path or the url of the license file of the software to be included in LICENSES directory.
    * Can be used multiple times.
    * You can use :project_license as a special value if the software is build related code and if it is using project's license.
* Add license, license_file and license_file_path DSL methods to project.
  * license (String): Sets the license of the project.
  * license_file (String): The relative path or the url of the license file of the project to be included in the file that will be created at project.license_file_path.
  * license_file_path (String): The relative path of the main license file that will be created for the project. Default: LICENSE.

With this omnibus will:
1. Collect all the license files specified in software components into install_dir/LICENSES directory.
2. Create a license file at install_dir/LICENSE which will contain license of the project and license information for all the software components that are being included.