Give editors ability to assign contributor, blogger roles & managers all roles

(short of administrator, which did require doing each role individually rather than 'all roles'
despite issues which suggested it wouldn't do the administrator.)

Ref #78

config/sync/user.role.manager.yml

@@ -35,6 +35,10 @@ permissions:
   - 'administer taxonomy'
   - 'administer url aliases'
   - 'administer users'
+  - 'assign contributor role'
+  - 'assign editor role'
+  - 'assign invited_blogger role'
+  - 'assign manager role'
   - 'bypass node access'
   - 'bypass node access'
   - 'create url aliases'