Remove Google Analytics stub.

We're not using it anyways.
Add a basic print style sheet.

Turns out the various bootstrap/html5boilerplate css has provisions for
print already, so there shouldn't be much to do except hiding some
stuff.

Note that there's still one major issue to be worked out:
- I don't know why long headers don't wrap but gets overflowed, it's
  probably a width setting in one of the boilerplate css? This also
  happens with long questions, so it has to be resolved somehow.
Add vim swap files to gitignore