Small css minifier improvements.
Do not respond 403 if guest want to sign out.

System version 0.451
modules:
Blogs 0.082
Comments 0.024
Cron 0.008
Deferred tasks 0.1.2+build-5
Disqus 1.0.1+build-3
Feedback 0.006
HybridAuth 2.1.1-cs38
OAuth2 0.032
Photo_gallery 0.022
Plupload 2.0.0-cs3
Static_pages 0.042
plugins:
Admin_default_theme 0.005
Fotorama 4.4.8-cs2
SimpleImage 2.4.0-cs1
TinyMCE 4.0.12-cs2