Added test case for fixing khmarbaise/iterator-maven-plugin#4.
Added name 'iterator.items' to items property. Fixes khmarbaise/iterator-maven-plugin#4.
Declared missing extra artifacts. Fixes khmarbaise/iterator-maven-plugin#6.
Merge branch 'cli-items-property' of https://github.com/ffray/iterator-maven-plugin into ffray-cli-items-property
- Integrated the pull request for enhancement
  via command line properties.
- Enhanced integration test to test all values
  of the property via command line.