Merge pull request #77 from github/rename-perm-event

update VFSForGit to linux-rename-events branch

add move permission and delete notification events

Merge pull request #75 from github/xattrs-nonblock-noread

add tests of projection state checks and modes

add docs re file permission issues with xattrs

fix return when retrying open() in project_file()

ensure user write on empty files/dirs for xattrs

enforce user read permission on all inodes

avoid reopening files when projection unnecessary

ensure user write perm available before projection

explicitly check inode type before file projection

never block when changing file projection state

set O_NOFOLLOW when projecting files or dirs

add missing O_RDONLY flag on initial lowerdir fd