Add proper disqus identifier comment count links

Fixes #277
Fix Disqus over https.

  Forcing http:// as protocol will make Disqus fail when server over
  https for security reasons.
Merge pull request #1384 from kAworu/fix-disqus-over-https

Fix Disqus over https.
Merge branch 'master' of github.com:imathis/octopress into source

* 'master' of github.com:imathis/octopress:
  Fix Disqus over https.
  Add proper disqus identifier comment count links
Fix for Gist Url being changed. Reads username from the config file