#26908 Added flame clip updater to nuke multi publish

This adds a new secondary task for the nuke publish which updates the clip xml for the current shot:

![screen shot 2014-12-12 at 16 27 41](https://cloud.githubusercontent.com/assets/337710/5416931/75acf72e-822c-11e4-9e83-252067670d8b.png)

When the flame box is ticked, items will appear in the version dropdown for that clip in flame:
![screen shot 2014-12-12 at 16 33 35](https://cloud.githubusercontent.com/assets/337710/5416941/9504469a-822c-11e4-853e-d71bcd4e4e52.png)



Not sure ... this example is very valuable, but it's huge, and it's easy to miss the comments about the new feed and version tags being added. Anyway to make it smaller ? It looks like some userData is already omitted, may be keep only one feed and one version examples, unless there differences that must be highlighted ?