Update iPad builder to preserve flix-flix.htmls

Added strict mode for html index page editing, for those series that
need to preserve original filenames (eg. "flix-flix.html) and delete all
others.  For most clients, the standard should be ok (correct backend
renamed to index.html, backend-qa.html preserved alongside
nobackend.html and nobackend-qa.html).
Automagically add alternate page names

The script will now automatically split any pages with "-" in the page
name into two alternate spread names and add those alternates to the
app.txt file.
SVN merge clean-up

Added 3 small tweaks that were in my current branch prior to running the
SVN->Git conversion.

Fixed bug with building single page books.
Deleted instructions doc from source control

Add documentation now found in the README.md file.