Fix compilation with Boost 1.53

cf. https://bugreports.qt-project.org/browse/QTBUG-22829
Merge pull request #36 from jspricke/master

Fix compilation with Boost 1.53
Fixed documentation in frustum_culling for transforming to robot coordinates
Merge pull request #38 from sdmiller/master

Fixed documentation for @FrustumCulling@
fixed a bug in BRISK keypoint estimation where if the keypoint type
would be different than PointWithScale a compiler error would occur
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.