Update README

Conflicts:
	documentation/README.md
Cleanup

Conflicts:
	documentation/src/main/asciidoc/contributing/Author_Group.adoc
	documentation/src/main/asciidoc/extending/Author_Group.adoc
	documentation/src/main/asciidoc/faqs/Author_Group.adoc
	documentation/src/main/asciidoc/user_guide/Author_Group.adoc
chapter intros
Reorganised section heads
Upgrading
Correct version
Fix Upgrading