Default paginator indicators shouldn't have an 'active' class

As said in the commits and title, default paginator indicators shouldn't have an 'active' class. The 'active' class was meant to indicate the current active page, not a clickable link to a page.

Also because of this, the 'active' class should never be used on 'previous' or 'next' links. 'Previous' or 'next' links are only meant to move towards the previous or next page in the sequence. They can't indicate an 'active' page stage because they aren't page indicators.

See the [Twitter Bootstrap docs](http://twitter.github.com/bootstrap/components.html#pagination) under `Pagination > Options > Disabled and active states` for more info.