Removed faulty role="row" on pager

In html5 it is only allowed to use role="row" under tables of type must
be contained in, or owned by, an element with role=grid or role=treegrid
or role=rowgroup.
The pager is none of those things (at present).
Merge pull request #671 from soerennielsen/master

Removed faulty role="row" on pager