Check if operation worked before sending post hooks, fixes #2484
Don't unlink old renamed file if stream copy failed
Merge branch 'master' into hook-improvements

Conflicts:
	lib/files/view.php
update 3rdparty submodule
Merge pull request #3628 from owncloud/update_3rdparty_submodule

update 3rdparty submodule
Merge pull request #2919 from owncloud/hook-improvements

Hook improvements
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
Merge branch 'master' into oc_preview
implement previews for single shared files