Minor fix in extension string used in io::loadPolygonFile.
The extension does not include the stop so the strings used for comparison should not either.
Merge pull request #40 from iglesias/dev

Minor fix in extension string used in io::loadPolygonFile.
Added Haar Cascades from OpenCV 2.4.0
Merge branch 'master' of https://github.com/PointCloudLibrary/pcl into people_prob