Added doc_serve signal
Add tox.ini for multi-version testing
add tox test environment for sqlite, and include elasticsearch
Python 2.6 compatibility - fixes #156
Renamed doc_serve signal to document_served
Added changelog entry for document_served signal
Merge pull request #208 from gasman/feature/tox

tox test environment and Python 2.6 support
Merge pull request #206 from kaedroho/doc-serve-signal

Added document_served signal
add changelog note re Python 2.6 compatibility
Eliminate 'patterns' from wagtailadmin/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailcore/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtaildocs/urls.py and admin_urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailembeds/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailimages/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailredirects/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailsearch/urls as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailsnippets/urls.py as per https://code.djangoproject.com/ticket/22218
Eliminate 'patterns' from wagtailusers/urls.py as per https://code.djangoproject.com/ticket/22218
Add a register_admin_urls hook so that subapps of wagtailadmin can register their urlpatterns with wagtailadmin, avoiding the need for them to be defined in the project's urlconf
Merge branch 'master' into python3

Conflicts:
	wagtail/wagtailsearch/tests/test_backends.py
	wagtail/wagtailsearch/tests/test_queries.py