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
don't show empty trash bin message for sub folders
Merge branch 'master' into trashbin_encryption
Merge branch 'master' into trashbin_encryption

Conflicts:
	apps/files_trashbin/index.php
	apps/files_trashbin/lib/trash.php
always use "==="
some final code clean-up
Merge pull request #1810 from owncloud/trashbin_encryption

Trashbin file encryption support