Make backbone fast.

Remove old 'template' render and replace with a backbone view for cells
which is created x*y times.  The extra view isn't necessary (eg. the
render method could create x*y dom elements stored in a matrix, and
onChange could update them).  This way is slightly more 'backbone' and
will scale better to more advanced cases.
Merge pull request #1 from cesutherland/gh-pages

Make backbone fast.