pos should never exceed strlen, else the overflow check 'if (!len)' will wrongfully pass

Fixed polarity of ImageRegistration mode in setDepthGeneratorProperty function of CvCapture_OpenNI2 class

simplified sample's interface (remove odd "no processing" branch, add print to screen for processing mode)

http://code.opencv.org/issues/4462

Adding &31 to bit shift in order to silince coverity BAD_SHIFT defect

add default_stripes_count const

Fix SVM::trainAuto (Bug #4464)

Scripts are updated for Linux-based (Ubuntu 14.04) mingw cross-compilation (full stack of scripts provided)
Part of these scripts may work under Windows installation of MinGW, but it is not supported.

FFMPEG update: 2.7.1
Added OpenH264 Cisco binaries support for H264 encoding: v1.4.0