:sparkles: Add force option in the ChangeSet DSL. Fix #81

[Tetragramato]

Add force to changeSet DSL, with tests and Doc :

changeLog {
    changeSet(id = "ChangeSet-bash-1", author = "Bash") {
        action {
            logger.info { "Hello $it!" }
        }
    }
    // Will be executed again
    changeSet(id = "ChangeSet-bash-1", author = "Bash") {
        force = true
        action {
            logger.info { "Will be executed again" }
        }
    }
}