Adding autotest-hhvm.sh
HHVM sets stream meta datum wrapper_type to 'File' instead of 'user-space'.
Clarify return values

This function returns `null` when no user is logged-in.
Fix typo
Merge pull request #12969 from owncloud/clarify-docs

Clarify return values
Merge pull request #11810 from owncloud/hhvm-autotest

Adding autotest-hhvm.sh [WIP]
add activity if public shared file/folder was downloaded
Make sure the path passed to the activity manager is normalized