feature wip: basic scoring

Score now displays as an h2.

Rita’s a bit more familiar with the UX right now, so we’ll discuss
where it should go later.
implemented a crude form of scoring

For correctly answering a question, the player is awarded ten points,
plus one point for every second left on the timer.

This gives a bigger reward when the player knows the answer off-hand,
encouraging tumblr-ness.
Merge branch 'master' into score-display

Conflicts:
	build/src/app/common/tags.js
	build/src/templates.js
Merge branch 'score-display'