Use stdlib JSON when available

Fall back to deprecated Django utils copy of simplejson otherwise.
Removed HTTP protocol specifier from templates/* and templatetags/disqus_tags.  Resolves issue #33, #18 and #15
Merge pull request #34 from arthurk/protocol-relative-urls

Removed HTTP protocol specifier from templates/* and templatetags/
Bumped version to 0.4.2.
Merge pull request #31 from funkybob/patch-1

Use stdlib JSON when available
Bumped version to 0.4.3
Merge branch 'master' of https://github.com/arthurk/django-disqus

Remove the protocol from the URL, to support https as well as http, while
keeping the fix that attaches comments to the correct page instead of the
site root URL.

Conflicts:
	disqus/templatetags/disqus_tags.py