rename constants
add quota streamwrapper that limits the amount of data that can be written to a stream
move storage wrapper test to new namespace
add quota storage wrapper
fix getPermissionsCache for storage wrapper
add option to wrap existing mounts
use renamed constants
add conveince function to wrap all storages
use storage wrapper for quota instead of a filesystem proxy
use renamed constants
fix quota wrapper reporting negative free_space, breaking user interface

return 0 instead
remove outdated quota proxy
merge master in storage-wrapper-quota
Merge pull request #4467 from owncloud/storage-wrapper-quota

Move quota logic from filesystem proxy to storage wrapper