Updated pdfexport plugin to work. Previous version of the file doesn't seem to be working anymore. I grabbed this change from Mark Chapman's plunk (http://plnkr.co/edit/t4aEBW)
Changes to confirm with style requirements

Added braces to if condition to confirm with style requirements.
Merge pull request #1346 from chandramuralis/ng-grid-pdf-export

Fixed issue in ng-grid-pdf-export plugin