#6 Auth error

commit 88c29cdf8e When I enter my username and password and press a button, I get traceback below and my browser opens pumpity.net

 Traceback (most recent call last):
   File "main.py", line 398, in <module>
     MediaGoblinApp().run()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/app.py", line 824, in run
     runTouchApp()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/base.py", line 487, in runTouchApp
     EventLoop.window.mainloop()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/core/window/window_pygame.py", line 401, in mainloop
     self._mainloop()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/core/window/window_pygame.py", line 288, in _mainloop
     EventLoop.idle()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/base.py", line 330, in idle
     self.dispatch_input()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/base.py", line 315, in dispatch_input
     post_dispatch_input(*pop(0))
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/base.py", line 281, in post_dispatch_input
     wid.dispatch('on_touch_up', me)
   File "kivy/_event.pyx", line 699, in kivy._event.EventDispatcher.dispatch (/tmp/pip-2e6Tk8-build/kivy/_event.c:7013)
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/uix/behaviors.py", line 163, in on_touch_up
     self.dispatch('on_release')
   File "kivy/_event.pyx", line 695, in kivy._event.EventDispatcher.dispatch (/tmp/pip-2e6Tk8-build/kivy/_event.c:6972)
   File "kivy/_event.pyx", line 1168, in kivy._event.EventObservers.dispatch (/tmp/pip-2e6Tk8-build/kivy/_event.c:12154)
   File "kivy/_event.pyx", line 1052, in kivy._event.EventObservers._dispatch (/tmp/pip-2e6Tk8-build/kivy/_event.c:11122)
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/kivy/lang.py", line 1465, in custom_callback
     exec(__kvlang__.co_value, idmap)
   File "./mediagoblin.kv", line 62, in <module>
     on_release: root.enter()
   File "main.py", line 48, in enter
     verifier_callback=self.ask_for_verifier
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/pypump/pypump.py", line 131, in __init__
     self.oauth_request()
   File "/home/breton/.virtualenvs/mediagoblinapp/local/lib/python2.7/site-packages/pypump/pypump.py", line 384, in oauth_request
     result = self.verifier_callback(self.construct_oauth_url())
   File "main.py", line 55, in ask_for_verifier
     box.add_widget(Button(text='Verify!',on_release=self.verifier(self.ids.verifier)))
   File "kivy/properties.pyx", line 720, in kivy.properties.ObservableDict.__getattr__ (/tmp/pip-2e6Tk8-build/kivy/properties.c:10924)
 AttributeError: 'super' object has no attribute '__getattr__'

Reworked sign-in flow to handle all major errors and give the user detailed feedback