- updated return value of points_classifier sample

Distance Transform tutorial fixes

Distance Transform fixes v.2

Distance Transform fixes v.3

Distance Transform fixes v.4

Let LineSegmentDetector output line segment coordinates in float precision, as supported by the LSD algorithm.

* GMG
* FGD

Signed-off-by: Yan Wang <yan.wang@linux.intel.com>

fixes for latest changes in opencv3.0 api

waitKey() normalization

fixed mser bindings

use abstract interface with hidden implementation

use new abstract interface and hidden implementation

use new abstract interface and hidden implementation

use new FastFeatureDetector abstract interface and hidden implementation

used BufferPool mechanism instead

* remove overloads with explicit buffer, now BufferPool is used
* added async versions for all reduce functions

Sample works with OpenNI2 with minimal code changes (CAP_OPENNI -> CAP_OPENNI2)