move2trash() handles keyfiles
put all trash bin content in user/files_trashbin
restore filekeys from trash bin
delete keyfiles if file in trash bin gets deleted permanently
reuse delete() function in expire()
update script which copies all trash bin related files to user/files_trashbin
some fixes for the keyfile handling
update path to deleted files
WebDAV-Testing:
- write the exception to the log
- in case curl is missing we should return true as well
don't show empty trash bin message for sub folders
Merge branch 'master' into trashbin_encryption
add a safe_mode check
fix getVersions(), we need to get the correct user and filename
Merge pull request #1812 from owncloud/add-logging-to-webdav-test-master

Enhancment to the WebDAV-Testing ...
make number-input fields look like they should
rename app to 'deleted files'
use :hover pseudo class to set opacity
IE8 does not support window.onclick
Merge pull request #1830 from owncloud/fix_css_number

make number-input fields look like they should
fix giant advanced caret in installation