Bootstrap redesign

This pull request redesigns the whole website.

* All templates have been modified to use bootstrap.
* Bootstrap JS, CSS and fonts have consequently been added to the repository.
* The new site CSS is in `aligulac-theme.css`, and the new site JS is in `aligulac.js`.
* This pull request also includes Prillan's JS refactoring with Coffeescript. This also minifies the JS.
* All JS have been moved to the end of `<body>` to increase the page load speed.

Some bugs and annoyances have been dealt with in the process. Notably, entering BYEs in single elimination prediction now works with autocompletion. Some strings that were left out of translation are now included, some were changed and some were added.

Known regressions:

* Backspace doesn't delete tags any more (player inputs).