Add social media buttons

the user is gone, userExists will not bring him back. But the user's …

[master] Verify if path exists

Let buttons hide the sidebar

Fix return value for OCP PHPDoc

Fix childs of slideToggle not sliding the target

We need to verify if the specified path exists to gracefully prevent errors.

Fix remaining avatar problems

Fix OCP PHPDoc

keep a read lock while scanning a file or folder

* was always a string instead of \OCP\IUser

Trim path in changeLock

Rethrow LockedException with full path

Load the update information asyncroniously to fix the page load speed

Throw exception if memcache misconfigured or missing

Convert invalid path exception to sabre exception on MOVE

Because the path is converted to md5 from the original exception,
rethrow the exception with the correct full path

Skip directory entry in S3 opendir