Merge pull request #238 from graphitefriction/1-5-docs

stages docbook and xhtml 1.5 changes
draft of first version of asciidoctor diagram docs

- TODO generated out file structure
- TODO sizing and positioning of image
- TODO link doc with other docs
Merge pull request #239 from graphitefriction/diagram

draft of first version of asciidoctor diagram docs
resolves #240

- creates AsciiDoc article template for 1.5
- adds link to template docs index page
- updates description and keyword for docs page and template page
Merge pull request #241 from graphitefriction/templates

resolves #240
Adds github link and fixes substitutions
subs test
block fix

TODO figure out why subs are not working on an open block
remove literal block until subs is fixed
Update Git project link
Merge pull request #242 from bry4n/patch-1

Update Git project link
adds source code block content

- documents uri attr asciidoctor/asciidoctor#800
- documents backslash asciidoctor/asciidoctor#1022
- documents source language asciidoctor/asciidoctor#888
- removes duplicates source code examples files
- updates include files for source code examples
- changes include file names for desc and keywords