move sd-card flash device detection to production

ensure that SD-Cards are flashed only in production mode
avoid reboot loops on update sd-card tryings ...
update hp2sm

* r3886
    - remove empty backup and update page
update hp-blob

* r3882
    Web-UI:
    - Everythink's async now.

* r3893
    Web-UI:
    - XBMC dialog did not show up after 'applying' of an update.
fix nginx configuration
    - fix disable accesslog
    - set client_max_body_size to fix file uploads for hp-backup
Update NEWS
Bump System-Image to 3.11.6

- Jump from 0.1.5 to 3.11.6 to keep smartphone Apps untouched