Find the country of origin of a tweet.

Currently using the `place.country` attribute of a tweet if it exists.

Finding the country from the coordinates is implemented, albeit in a very slow
(and dumb) fashion. Needs to improve on that before using it.
Add a language distribution bar chart.

There are two sidebars now. The right one contains the bar chart.
Remove the right sidebar. Everything on the left.

Previously, there was two sidebars. The language radio buttons were in the left
and the graphics were in the right. Everything is in the left one now.
Add country bar chart.
Remove radio buttons, replace with select.

Languages are now selected using a select element instead of radio buttons.
Prefix class names with `js-` when used in JS.

HTML element class names reference by Javascript code are prefixed with `js-`.
Re-style.
Fix language code for Bahasa Indonesian: id -> in
Fix resize not showing all-canvas.
Fix for unknown origin.
Cosmetics on the sidebar menu.

- Increase the height and bottom margin of the country barchart.
- Change color of the select form.
- Rename select form label.
Merge pull request #19 from hdemers/country-origin

Country origin