Add support for adding meals.

Hide some columns and the map on mobile.

Fix some issues with the map pins.
Add meals servlet to display meals. No sorting or filtering yet.

Also, do the lazy thing and store the meal date in the format that the <input type="date"> ends up POST'ing. YYYY-MM-DD.
Trying to simplify type conversion a bit. Redis hashmaps are strings-only.
Added meal sorting.
Merge branch 'master' of https://github.com/nurblieh/restos