Added MOG and MOG2.
Resolved a compiling error under Linux.
Resolved a compiling warning under Windows.
Resolved compiling errors under Linux.
Used perf_precomp.hpp instead of precomp.hpp for test.
Merge pull request #4 from Itseez/2.4

OpenCV changes
Fix bilateralFilter function
Optimized mog and mog2, which have much better performance.
Added a new tutorial "Using OpenCV Java with Eclipse". Removed information related to Eclipse from "Desktop Java" tutorial.
rewrite gpu stereo multi gpu sample:

* use different approaches -> threads and streams
* clean up code
add adaptive bilateral filter (cpp and ocl version)
fix warnings
Removed the trailing whitespace
Removed trailing whitespace
Removed whitespace.
Added perf namespace.
Removed performance test.
Add IPP support in compare function
Added fix in CMakeLists.txt for contrib module.
Native camera libraries updated.

Android 4.3 support added;
ANY camera index support fixed;
applyProperties now uses camera->reconnect() instead close/connect for Android 4.x.
(cherry picked from commit fff91eef0bd301e791173259ccf884c23397c956)