[JENKINS-16356] Show seed job and template job info in the generated job

Covers JENKINS-16356 and JENKINS-16357.

Sample result:
![image](https://cloud.githubusercontent.com/assets/1336981/5404267/22711652-818d-11e4-815a-b2f4a4aa0e0c.png)

Why is this class necessary? The generatedJobName is only used for comparison, but it's also the key in the generatedJobMap, so only those GeneratedJobSeedReferences will be compared where the generatedJobMap is the same.