lesson_initialize: windows compatibility

Author: maxim-belkin

bin/lesson_initialize.py

@@ -12,11 +12,11 @@
     'CONTRIBUTING.md',
     'README.md',
     '_config.yml',
-    '_episodes/01-introduction.md',
-    '_extras/about.md',
-    '_extras/discuss.md',
-    '_extras/figures.md',
-    '_extras/guide.md',
+    os.path.join('_episodes', '01-introduction.md'),
+    os.path.join('_extras', 'about.md'),
+    os.path.join('_extras', 'discuss.md'),
+    os.path.join('_extras', 'figures.md'),
+    os.path.join('_extras', 'guide.md'),
     'index.md',
     'reference.md',
     'setup.md',
@@ -39,7 +39,7 @@ def main():
     # Create.
     for path in BOILERPLATE:
         shutil.copyfile(
-            "bin/boilerplate/{}".format(path),
+            os.path.join('bin', 'boilerplate', path)
             path
         )