resolves #142 makes install and upgrade directions same thru docs

- changes examples dir to _includes dir
- adds _includes dir attribute to applicable files
- creates install and upgrade include file
- creates text editor include file
- removes installing and using AsciiDoc from most docs
- updates pdf usage links to asciidoctor fopdf repo
Merge pull request #143 from graphitefriction/install-include-file

resolves #142 makes install and upgrade directions same thru docs