Merge pull request #4292 from terman/jsinput

Supply initial_state attribute for jsinput tag

docs/en_us/developers/source/extending_platform/javascript.rst

@@ -294,6 +294,9 @@ The following table describes the attributes of the ``jsinput`` element.
      - The function in your JavaScript application that saves the state of the
        objects.
      - ``JSObject.setState``
+   * - initial_state
+     - A JSON string representing the initial state, if any, of the objects.
+     - '{"selectedObjects":{"cube":true,"cylinder":false}}'
    * - width
      - The width of the IFrame in which your JavaScript application will be
        displayed, in pixels.
@@ -309,4 +312,4 @@ The following table describes the attributes of the ``jsinput`` element.
    * - sop
      - The same-origin policy (SOP), meaning that all elements have the same
        protocol, host, and port. To bypass the SOP, set to ``true``.
-     - false
+     - false