Add http-protocol.txt

(from Scott Chacon)
Create pdf and mobi from all html files

- combine all html files into a single html file; insert page breaks to separate major sections
- use wkhtmltopdf (V0.9.9 "patched QT") to transform html into pdf
- use kindlegen (V2.8) to transform html into mobi
Wire html for ./relnotes and fullpdf target in Makefiles

- new target "relnoteshtml" creates html for all release notes
- new target "fullpdf" creates "git-doc.pdf" and uses targets "html", "relnoteshtml" and "pdf"
Disable reconfiguration due to changed GIT-VERSION-FILE