Updated 6.1.x Dev Guide for 6.1.30

Hi Jesse,

I've updated the guide with the new Service Builder chapter and with an updated event-listing-portlet. I had to change the portlet to NOT use the 'editor' hint, which I liked in 6.2, that is not present in 6.1. The portlet deploys and works well.

The only issue is that it creates a .war file that has an incompatible name. It names it event-listing-portlet-6.1.1.1.war instead of event-listing-portlet-6.1.2.1.war. I'm not sure where it's getting the 6.1.1 part. Maybe it is because the SDK is from the previous version. In any case, can you look into it with a 6.1.x branch based off of this branch?

Note, this branch is different from my previous branch. So make sure to do 'git checkout -b topic' from the 6.1.x branch, NOT the previous branch I sent.

I've got to debug something going wrong in the markdown conversion. But should be easy to uncover and fix. I'll give you a shout when I fix the markdown.

- Jim