Remove py2 compat future imports

Author: vidartf

examples/threejs/voxel_painter.ipynb

@@ -21,15 +21,6 @@
     "    - Delete voxel when shift-clicked"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from __future__ import division, print_function"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,

js/scripts/templates/py_top_level_init.mustache

@@ -2,8 +2,6 @@
 # This file automatically generated by {{ generateScriptName }}
 #
 
-from __future__ import absolute_import
-
 {{#each modules as |module|}}
 from {{ module.pyRelativePath }} import *
 {{/each}}

pythreejs/pythreejs.py

@@ -9,8 +9,6 @@
 will use this foundation to build higher-level interfaces to build 3d plots.
 """
 
-from __future__ import absolute_import
-
 from ipywidgets import Widget, widget_serialization
 from traitlets import Unicode, CInt, Instance, List, CFloat, Bool, observe, validate
 import numpy as np