Fix test_edit_handlers breaking other tests
Update snippets tests

Add an Advert fixture so that Advert objects do not need to be created
by the tests that use them.
Merge branch 'master' into fix-edit-handlers-test

Conflicts:
	wagtail/wagtailadmin/tests/test_edit_handlers.py
Merge branch 'master' into fix-edit-handlers-test

Merge. Remove deprecated tests.

Conflicts:
	wagtail/tests/fixtures/test.json
Fix wagtailsnippets.tests.TestSnippetChooserPanel

Fix wrong argument type passed to SnippetChooserPanel
Added purge_url_from cache to wagtailfontendcache.utils
Added little section in the docs describing purge_url_from_cache
Removed EditHandler tests. Added more FieldPanel tests
Merge branch 'master' into fix-edit-handlers-test

Conflicts:
	wagtail/wagtailembeds/tests.py
Tweak FieldPanel tests
frontend cache purge docs change
Merge branch 'master' into fix-edit-handlers-test
Use UTC timezone in tests

This prevents Django from converting times in tests
Fix FieldPanel test failures
Merge pull request #414 from kaedroho/frontendcache-purge-url

Allow purging individual URLs from frontend cache
Remove mock expected calls from edit handler tests

'Expected calls' works differently in Python 2 and 3
Merge pull request #363 from mope/fix-edit-handlers-test

Tidy up unit tests
Cleanup a few methods of UserPagePermissionsProxy
Merge pull request #417 from kaedroho/wagtailcore-cleanup-3

Cleanup a few methods of UserPagePermissionsProxy