upgraded ruby to 2.1.5 and jekyll to 2.5.3
removed old archive page generator 'cos it was breaking with the new ruby and new jekyll
will have to replace it with something else.
also carved up the previous _layout/default.html to resemble output from `jekyll new`
(planning to borrow heavily from jekylls new default layout for css media queries)
added periodic layout for month and year index pages
replaced index pages for every month and year with new template-generated ones
minor cleanup
added post about microagression and the bus stop
removed FSM related stuff from rakefile.rb