Don't hardcode `bootstrap.min.js`'s version.
Update timeline URL to the latest one and fix a Jade issue.
Minor favicon changes.

* set maxAge to 1 week
* serve the file from a consistent path
Merge pull request #438 from XhmikosR/bsjs-ver

Don't hardcode `bootstrap.min.js`'s version.
Merge pull request #443 from XhmikosR/develop

Update timeline URL to the latest one and fix a Jade issue.
Merge pull request #444 from XhmikosR/favicon

Minor favicon changes.
extras_popular.jade: Add jQuery Tablesorter plugin.

This allows us to sort the table.

TODO: Get rid of the empty `th`.
Disable sorting for the empty `th`.