Bootstrap overrides: Increased specificity of pagination and pager's arr...

...ow SCSS selectors and disabled them in IE8...

* Prevents the arrows from appearing when rel attributes are set on numbered links that have the same destinations as the "Previous"/"Next" links.
* Arrows have been disabled in IE8 since it lacks support for :last-child (would look really strange if only :first-child arrows continued to be shown).
This will create issues for the DataTables pagination as it uses this same CSS but the links are not children of an li element. To test, set the working examples table to show only 10 entries and then you will see the Next button in the pagination.