Add new function

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

neutered-filesystem.go

@@ -9,6 +9,10 @@ type NeuteredFileSystem struct {
 	fs http.FileSystem
 }
 
+func New(fs http.FileSystem) NeuteredFileSystem {
+	return NeuteredFileSystem{fs}
+}
+
 func (fs NeuteredFileSystem) Open(name string) (http.File, error) {
 	f, err := fs.fs.Open(name)
 	if err != nil {