Initial interface for javascript contentmanagers

contentmanager.js is going to be a js proxy for the current
filenbmanager.py.  This will allow a contentmanager for Google Drive to
be created.

IPython/html/static/base/js/contentmanager.js

@@ -0,0 +1,42 b''
+// Copyright (c) IPython Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+define([
+    'base/js/namespace',
+    'jquery',
+], function(IPython, $) {
+    var ContentManager = function() {
+        // Constructor
+        //
+        // A contentmanager handles passing file operations
+        // to the back-end.  This includes checkpointing
+        // with the normal file operations.
+        //
+        // Parameters:
+        //        None
+        this.version = 0.1;
+    }
+
+    ContentManager.prototype.new_notebook = function() {
+    }
+
+    ContentManager.prototype.delete_notebook = function(name, path) {
+    }
+
+    ContentManager.prototype.rename_notebook = function(new_name, new_path, old_name, old_path) {
+    }
+
+    ContentManager.prototype.save_notebook = function(notebook, extra_settings) {
+    }
+
+    ContentManager.prototype.save_checkpoint = function() {
+    }
+
+    ContentManager.prototype.restore_checkpoint = function(id) {
+    }
+
+    ContentManager.prototype.list_checkpoints = function() {
+    }
+
+     return ContentManager;
+});