changed h3, h4 markdown font sizing to match markdown spec -- h3: 1.5em, h4: 1.2em
changed h3, h4 markdown font sizing to match markdown spec -- h3: 1.5em, h4: 1.2em

8thcolor/rubyconfau2015-sadr,8thcolor/rubyconfau2015-sadr,8thcolor/eurucamp2014-htdsadr,8thcolor/rubyconfau2015-sadr,8thcolor/eurucamp2014-htdsadr,8thcolor/eurucamp2014-htdsadr