Finalise 0.8.7 in documentation

Conflicts:
	CHANGELOG.txt

CHANGELOG.txt

@@ -48,7 +48,7 @@ Changelog
  * Added a new decorator-based syntax for RoutablePage, compatible with Django 1.8
 
 
-0.8.7 (xx.xx.2015)
+0.8.7 (29.04.2015)
 ~~~~~~~~~~~~~~~~~~
 * Fix: wagtailfrontendcache no longer tries to purge pages that are not in a site
 * Fix: The contents of <div> elements in the rich text editor were not being whitelisted

docs/releases/0.8.7.rst

@@ -1,6 +1,6 @@
-============================================
-Wagtail 0.8.7 release notes - IN DEVELOPMENT
-============================================
+===========================
+Wagtail 0.8.7 release notes
+===========================
 
 .. contents::
     :local: