add channel 3 support
add fast way Between CPU and GPU for the data which is aligned

Signed-off-by: yao <bitwangyaoyao@gmail.com>

facerec.cpp: Removed Original LBP wrapper, because it is not in use and therefore generates a warning.

facerec.cpp: Added an exception to the LBP extraction, so now a meaningful exception is thrown if the wrong image type was given. Thanks to Eric Christiansen for reporting.

Android 4.1.1 native camera fix. BufferQueue class is used instaed of Surface texture. Includes in cmake updated.

FaceRecognizer supports updating a model now. Documentation has been updated to reflect latest changes.

building descriptor index on target capture
simple AR experiment (work in progress)

Updated the train method to be an InputArrayOfArrays, so the Python wrapper now generates the correct code (and it works).

Updated the documentation to (1) reflect the latest changes and (2) answer some questions I were asked.

Fixed facerec_eigenfaces.cpp demo sample: it contained hardcoded values, which made wrong element access possible. Fixed unsigned integer/signed integer warnings in facerec.cpp.

Bug #2214: Fixed bug, when calling the train method multiple times. The Eigenfaces and Fisherfaces method now re-estimate the model, the LBPH method appends the new data to the existing model.

Optimization introduced in b782d8bb only works for 64-bit builds, but
ifdef failed to check for this.

ASIFT

ASIFT