Added 'SlideAre'a prefab and 'PathSeg_03' path segment used for demonstrating slides (used in test_08 scene).

Tweaked 'JumnpArea' prefab so that trigger volume offset is based on path
sub segment end (currently sub segment length is 10 units).
Not exactly sure what was changed.
This might be due to using different Unity revisions (4.0.1f2 and
4.0.0f7).
Updated test_08 scene to include path segment with slide areas.