MoreFiles: fix one javadoc entry
Update README
java.nio.file is JSR 203, not 202...
Javadoc updates
PermissionsSet: make final
Add comment
MoreFiles: implement, test .changeMode()

No recursive version yet. This will only make sense when at least X is
supported.
build.gradle: change version and description
Release notes file; complement CONTRIBUTORS.md
0.1.0
Announce 0.1.0
Update README
Fix README
Update contributors and readme files
Fix contributors file
Update memoryfilesystem dependency to 0.6.2

Umask fixed!