Security improvements for Apache2 web server.
A lot of redundant `.htaccess` files removed.
`custom` directory added - it may contain custom scripts created manually or by components in order to avoid conflicts in single `custom.php`.
`custom.php` is not used any more (will be moved into `custom` directory automatically during update).
Small fix in styles.

System version 0.450
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