Don't return json error but null if card can't be parsed.
Small check for non-parsable card in index.php.

automatically upgrade the main database on version number increase (doesnt work with sqlite for now)

finish the application store feature so that users can download and install ownCloud apps from our website. there is still a small problem with write permissions. will look into this later

add a formfactor session variable which is autodetected but can also manually overwritten via a get variable.
currently we have:
         * default -> the normal desktop browser interface
         * mobile -> interface for smartphones
         * tablet -> interface for tablets
         * standalone -> the default interface but without header, footer and sidebar. just the application. useful to use just a specific app on the desktop in a standalone window.
In the future we should adapt the userinterface to the specific formfactor.