prepare for 1.1 release

Conflicts:
	CHANGELOG.txt
	wagtail/wagtailcore/__init__.py

CHANGELOG.txt

@@ -7,7 +7,7 @@ Changelog
  * Fix: Deleting a page permission from the groups admin UI does not immediately submit the form
 
 
-1.1 (xx.xx.xxxx)
+1.1 (15.09.2015)
 ~~~~~~~~~~~~~~~~
 
  * Implemented the `specific()` method on PageQuerySet, to return pages as their most specific type

docs/releases/1.1.rst

@@ -1,6 +1,6 @@
-==========================================
-Wagtail 1.1 release notes - IN DEVELOPMENT
-==========================================
+=========================
+Wagtail 1.1 release notes
+=========================
 
 .. contents::
     :local:

wagtail/project_template/requirements.txt

@@ -1,2 +1,2 @@
 Django>=1.8,<1.9
-wagtail==1.1rc1
+wagtail==1.1