Cleanup and modernize S3Adapter to ES6 syntax.

src/Adapters/Files/FilesAdapter.js

@@ -0,0 +1,22 @@
+// Files Adapter
+//
+// Allows you to change the file storage mechanism.
+//
+// Adapter classes must implement the following functions:
+// * createFile(config, filename, data)
+// * getFileData(config, filename)
+// * getFileLocation(config, request, filename)
+//
+// Default is GridStoreAdapter, which requires mongo
+// and for the API server to be using the ExportAdapter
+// database adapter.
+
+export class FilesAdapter {
+  createFile(config, filename, data) { }
+
+  getFileData(config, filename) { }
+
+  getFileLocation(config, filename) { }
+}
+
+export default FilesAdapter;