Removed patched treebeard from vendor folder
Updated wagtail to use treebeard 2.0
Pin django-taggit to 0.11.2
Django-taggit 0.12.x seems to break wagtail
Merge branch 'master' into treebeard-update

Conflicts:
	setup.py
Use Treebeard 2.0 add_child method
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