Merge pull request #29 from aschn/master

Update docs to make the tutorials Django-compatible.

README.rst

@@ -69,6 +69,11 @@ specific settings can be specified using a platform key::
                     'toga-ios'
                 ]
             },
+            'django': {
+                'app_requires': [
+                    'toga-django'
+                ]
+            },
         }
     )
 

docs/tutorials/tutorial-0.rst

@@ -44,7 +44,7 @@ Finally, we have to add the setuptools ``setup.py`` script:
     from setuptools import setup, find_packages
     
     setup(name='HelloWorld',
-        version = '0.1',
+        version = '0.1.0',
         packages = find_packages(),
         options = {
             'app': {

docs/tutorials/tutorial-1.rst

@@ -30,31 +30,33 @@ of ``setup.py`` script:
       }
   )
 
-And now you can update the application, using for example the Toga Hello World, 
-found at <https://toga.readthedocs.io/en/latest/tutorial/tutorial-0.html>:
+And now you can update the application, using, for example, the Toga Hello World
+found at <https://toga.readthedocs.io/en/latest/tutorial/tutorial-0.html>,
+modified to be class-based:
 
 .. code-block:: python
 
     import toga
-  
-  
-    def button_handler(widget):
-        print("hello")
 
+    class HelloWorld(toga.App):
 
-    def build(app):
-        box = toga.Box()
+        def startup(self):
+            self.main_window = toga.MainWindow(self.name)
+            self.main_window.app = self
+      
+            box = toga.Box()
 
-        button = toga.Button('Hello world', on_press=button_handler)
-        button.style.set(margin=50)
-        box.add(button)
+            button = toga.Button('Hello world', on_press=button_handler)
+            button.style.set(margin=50)
+            box.add(button)
 
-        return box
+            self.main_window.content = box
+            self.main_window.show()
+  
+        def button_handler(widget):
+            print("hello")
 
 
-    if __name__ == '__main__':
-        app = toga.App('First App', 'org.pybee.helloworld', startup=build)
-        app.main_loop()
 
 Create the iOS app
 ------------------