Add tests for Solr/ES spatial order_by

This exists primarily to avoid the possibility of breaking
compatibility with the inconsistent lat, lon ordering used
by Django, Solr and ElasticSearch.

Travis: Enable IRC notifications

Mark 2.2.X as incompatible with Django 1.7

Release v2.2.0

Bumped to v2.1.0!

Bumped to v2.0.0!

Bumped to v1.2.7!

Fixed a bug where South would cause Haystack to setup too soon. Thank…

…s to adamfast for the report!

I hate Python packaging.