use places/folder icon,
move link construction to JS,
only show icon on hover,
use 'searchresult' as css class name,
add filter/unfilter methods,
highlight searched files in current filelist
only filter when correct FileList is present

http://caniuse.com/#search=radius

http://caniuse.com/#feat=css-boxshadow

Fixes: oc-1369

respect coding style

The data supplied is never used in OwnCloud. Removed the call from all the apps, and made the public API function empty.

Create OC_JSON class, for single point of creating json responses.
No real logic change, this just cleans up the code a bit.

Created the following function:
 - checkLoggedIn
 - checkAdminUser
 - redirectToDefaultPage

Removed global vars are DOCUMENTROOT, SERVERROOT, SUBURI, WEBROOT and CONFIG_DATADIRECTORY