Don't try to support IPython 2.x

It's already broken, and has been for some time.

README.rst

@@ -6,17 +6,15 @@ This is a Turtle module for the IPython notebook. It's based on code by
 as a class assignment (the other was `PACattack <http://macewancmpt395.github.io/PACattack/>`_;
 I could have based this on either, but I had to pick one).
 
-To use it, first run this (you can skip this on IPython 3 or above)::
+Mobilechelonian requires IPython 3 or above.
 
-    from mobilechelonian import prepare_js
-    prepare_js()
-
-Then create a turtle and draw::
+Using it looks like this::
 
     from mobilechelonian import Turtle
     t = Turtle()
     t.speed(5)
     colours=["red","blue","yellow","brown","black","purple","green"]
+
     t.penup(); t.left(90); t.forward(200);t.right(90);t.pendown()
     for i in range (0,18):
         t.pencolor(colours[i%7])

Test.ipynb

@@ -10,25 +10,13 @@
    "name": "python3"
   },
   "name": "",
-  "signature": "sha256:6986cc358be838072e377a7a9d1d7e74b0dcd7d9ddfbb19bdbc33bf8e8125e94"
+  "signature": "sha256:91c2a08fe2a3a6fe5c5fade1a8497ad53afd46ec5d686e84b5cee6eb9f0e8bd4"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
  "worksheets": [
   {
    "cells": [
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "from mobilechelonian import prepare_js\n",
-      "prepare_js()"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [],
-     "prompt_number": 1
-    },
     {
      "cell_type": "code",
      "collapsed": false,
@@ -48,8 +36,7 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [],
-     "prompt_number": 2
+     "outputs": []
     },
     {
      "cell_type": "code",
@@ -59,8 +46,7 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [],
-     "prompt_number": 3
+     "outputs": []
     }
    ],
    "metadata": {}

mobilechelonian/__init__.py

@@ -3,25 +3,12 @@
 
 from IPython.html import widgets, nbextensions
 from IPython.utils.traitlets import Unicode, List
-from IPython.display import display, Javascript
+from IPython.display import display
 
 def install_js():
     pkgdir = os.path.dirname(__file__)
     nbextensions.install_nbextension([os.path.join(pkgdir, 'mobilechelonianjs')], symlink=True)
 
-def prepare_js():
-    """Prepare Javascript - needed on IPython 2.x before using Turtle.
-
-    This is unnecessary on IPython 3 or above.
-    """
-    install_js()
-    display(Javascript("""require(['nbextensions/mobilechelonianjs/turtlewidget.js',
-                                   'widgets/js/manager'],
-                                  function(turtlemod, manager) {
-                                    manager.WidgetManager.register_widget_view(
-                                        'TurtleView', turtlemod.TurtleView);
-                                 }, function(err) {console.log(err);});"""))
-
 class Turtle(widgets.DOMWidget):
     _view_module = Unicode("nbextensions/mobilechelonianjs/turtlewidget", sync=True)
     _view_name = Unicode('TurtleView', sync=True)