More better documentation

Updated README

Update manual.ad

Renamed manual.ad.  It is now manual.adoc

Bring up to date

Removed bad charcters from elliptic.ad

added missing files

reorganized files prior to squahing (safety push)

reorg

run now takes sample1.adoc, elliptic.ad, where these are in ./test,
and produces test/foo.tex as output -- this keeps the main
directory clean
squashng too numerous commits

Merge branch 'master' of https://github.com/jxxcarlson/asciidoctor-backends