fixes #6626 / BZ 1079958 - content dashboard - fix N results

On the Content Dashboard, the "N results" selection is broken when
running in rails 3.2.8 (e.g. RHEL6.5).  This commit ensures that
the selection will work both in the development environment as well
as production.
Merge pull request #4432 from bbuckingham/issue-6626

fixes #6626 / BZ 1079958 - content dashboard - fix N results