Conflicts:
	lib/private/vcategories.php

This is for all LowerCaseConstant warnings

put all the calls into one function and use tabs instead of spaces. Thanks to danimo for bugging me :-)

add a sane socket timeout so that the interface stays responsive with a slow or not working internet connection

Added failsafes for retrieving remote apps on settings->apps page, in case categories or app data are not found

show a label if an app is an internal app or a third party app from the app store.
show a preview image of the app if available

also make it possible to switch the app store and the knowledgebase off completely.

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