Support For Node Stalker Plugin

This pull request adds support for the [Node Stalker Plugin](https://wiki.jenkins-ci.org/display/JENKINS/Node+Stalker+Plugin).

The syntax is

```groovy
job {
    ...
    runOnSameNodeAs(String jobName, boolean useSameWorkspace = false)
    ...
}
```

Example

```groovy
job {
    ...
    runOnSameNodeAs('my-other-job', true)
    ...
}
```