changed all 'class' to 'data-status' for values of 'draft' and 'informal'
added 'data-status' attribute and Wiki page
updated 'data-status' styles
minor changes to 'data-status' css
rearranged some css files
Merge branch 'develop' into feat#6-status

Conflicts:
	core/styles/all.css
	core/styles/typo/text/_doctext.less
changed css comment filenames again
Merge branch 'develop' into feat#6-status

Conflicts:
	core/styles/all.css
updated classical music blog post
moved Interface
changed Greek names of headings and lists to three letters
fixed subheading Object
fixed subheadings in HTML documents

closes #28
updated headings blog post; deleted dog-training blog post
fixed data-status on HTML blog posts

TODO: convert TODO items (from `/blog/TODO.md`) to GitHub issues

closes #6
Merge branch 'feat#6-status' into develop
Merge branch 'develop' into feat#26-resprint
Merge branch 'fix#28-headings' into develop

Conflicts:
	blog/classical-music.html
	blog/dog-training.html
	blog/headings.html
	blog/math-changing-world.html
	blog/semantic-punctuation.html
	core/doc/typo.html
moved all breadcrumbs to bottom of page below 'main' element
changed indent levels