Features/html templates (and score calculation)

This adds the file index.html, which contains the templates we have right now: `status-tmpl`, `list-tmpl`, and `login-tmpl`. It also adds Michael's efficiency-score-calculating code into the model in StartEnd.js.

Currently, index.html includes StartEnd.js, which uses the `status-tmpl` view to show start/end buttons, display location information and current score, and show a map. Except the map doesn't appear.

Eventually, we'll need index.html to analyze the current URL to determine which models and views to display.