Material design: Use colors from the Material design palette.

Including specifying a colorPrimaryDark which changes the status bar
above the actionbar/toolbar, because that seems to be normal.
Login: Move the toolbar up out of the LinearLayout that has padding.

So it is flush with the status bar and the sides, like the other
activities.
Layout XML: Fix typos in the tools: attributes.

These were copy/paste errors.
QuestionFragment: Reduce the minimum padding inside the answer buttons.

To avoid words being broken across lines on the "Is Anything Odd?"
question with the Material (AppCompat) theme on, for instance,
a portrait Nexus 4.