Relax default permissions of created directories

Fixes issue #1.

README.md

@@ -131,3 +131,6 @@ can be used to set up multiple replds instances. For an instance named
 will create the *replds-foo* user and group. Add users that need to
 read the repository files to that group. The configuration will be
 read from */etc/replds/foo.yml*.
+
+Note that files created by the daemon will be world-readable by
+default. Set the process umask if you wish to restrict this further.

fs.go

@@ -55,7 +55,7 @@ func (f *FS) setNode(node Node) error {
 	// Create parent directory if it does not exist.
 	dir := filepath.Dir(path)
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
-		if err = os.MkdirAll(dir, 0700); err != nil {
+		if err = os.MkdirAll(dir, 0755); err != nil {
 			return err
 		}
 	}