Minor JS cleanup.
extras_popular.jade: Tweak progress bars.
Lowercase var names.
Add a warning for Internet Explorer <= 8.
Merge pull request #451 from XhmikosR/develop

Update Google Analytics code.
Merge pull request #452 from XhmikosR/js

Minor JS cleanup.
Merge pull request #453 from XhmikosR/progress-bar

extras_popular.jade: Tweak progress bars.
Merge pull request #454 from XhmikosR/lowercase

Lowercase var names.
Merge pull request #455 from XhmikosR/warn-old-IE

Add a warning for Internet Explorer <= 8.