changes to allow any number of preprocess scripts to run
changes to allow any number of preprocess scripts to run
typo fix. expanded explanation
Overall improvements to node reference build process.

- new div class introduced to handle titles that aren't attached to images (to work around asciidoc limitiation - everything is same kind of title). css code to style appropriately and set the alignment. Manually setting div class in asciidoc generation process
- addresses great-grand-children plug problems, redundant name/enabled children, and user plugs - fixes #167
- code clean up and re-arrangement