Fixing the release plugin

[rpatrick00]

With these changes, the process to cut a new release is:

1. Make sure that your local repo is in sync with origin/master and that the local repo is on the master branch (there can be no outstanding changes or commits on the master branch).
2. Run the following command just to ensure that the build and tests are succeeding:

    mvn clean verify

3. Create a release.properties file in the root of the project with the following content

    releaseVersion=<non-snapshost-version>
    developmentVersion=<next-snapshot-version>

4. Run the following command:

    mvn -B release:prepare release:perform

5. Create a new release in github based on the tag release-<non-snapshot-version> and upload the new installer from ~/.m2/repository/com/oracle/weblogic/lifecycle/weblogic-deploy-installer/<non-snapshot-version>/weblogic-deploy-installer-<non-snapshot-version>.zip.