- added reference implementation section 1.2

- added URI overview table
- minor fixes
- prepare for pandoc TOC support
- Updated README.md
 - avoid build failure due to missing license header in generated spec html file using pandoc template.
 - fixed line lengths in PDF files (GitHub markdown linebreak behavior differs from all other MarkDown flavors)
 - removed escape chars.
Merge pull request #355 from robertoschwald/CAS-1284

[CAS 1284] Validate and adopt CAS3 protocol rev