simplify the kernel logic when using rect kernel or without ROI
onCameraFrame callback signature changed. CvCameraFame interface added.

New interface allows to get one RGBA or Gray frame from camera or both in the same time;
New interface fixes data rase in samples also.
Android samples updated according onCameraFrame callback signature change.
FpsMeter class removed from Image Manipulations and Face Detection examples as unused code.
remove the warnings in accuracy test
Code review issues fixed. Compatibility issues fixed.
some bugs fix in using AmdFft library
15-puzzle app reverted to usage of old CvCameraViewListener implementation;
super.onPause() call moved to begining of onPause method according Google recomandations.
Tutorial for Android synchronized with actual application framework.
fixed assertion failure (vector out of range) for the 'vc10,debug' build (#2775)
fixed problem with Nx2 numpy arrays in geometrical functions (#2783)
Merge pull request #450 from bitwangyaoyao:2.4_dft
Merge pull request #452 from asmorkalov:android_tutorial_update
Merge pull request #455 from AlexeySpizhevoy:2.4
Merge pull request #402 from asmorkalov:samples_data_rase_fix
Merge pull request #428 from bitwangyaoyao:2.4_erode_dilate
Merge pull request #456 from vpisarev:python_ptseq_fix