Document how to enable Disqus comments globally and per post/page
Merge branch 'master' of https://github.com/mmistakes/so-simple-theme

# By Roman Valls Guimera
# Via Michael Rose (1) and Roman Valls Guimera (1)
* 'master' of https://github.com/mmistakes/so-simple-theme:
  Solves issue #94 with disqus comments being enabled by default globally