Merge pull request #248 from graphitefriction/1-5-docs

documents asciidoctor/asciidoctor#1027
fix AsciiDoc syntax errors
prefix release notes file with underscore
upgrade to Asciidoctor 1.5.0.rc.4

- upgrade to Asciidoctor 1.5.0.rc.4
- enable compat-mode by default
- upgrade to Font Awesome 4.1
- align stylesheet with default stylesheet (mostly)
- update description
- cleanup styles
disable rdoc until we convert to YARD
upgrade Google Analytics tracking code
tweak letter spacing for bold text
tweak letter spacing again
add dimensions to headshots
fix toc
fix tocs
update news archive
reduce size of article metadata
set safe mode to unsafe to allow includes to work
remove wordwrap control in footer
fixup styles on front-page and top bar
update message
add profile option to preview task
stage the show_drafts flag in the dev profile
set font-style to normal for em in post header