Add vim bindings (j/k) for prev/next and space

- Mapped j/k down/up vim bindings to next/prev because muscle memory
- Mapped space to next because it's a large, easy-to-hit button, and
  it's default behavior is to go down anyway, which would throw off
  the alignment.
- Added preventDefault call on the event so that default up/down/space
  behavior wouldn't affect the alignment
Adding the built files.