1. Add the test case of use the result of training
1. the first result of train
1. tools/mark.cpp
	- Modify the write_file() interface, Add parameters
	- Add the interface `idx_from_sample`, which is use for
	  generate idx-file from pure samples
	- Modify the case gesture.mark, add the option of saving ROI to BMP

2. CMake/v.idx
	- Add the 40+ new samples

3. CMake/CMakeLists.txt
	- Add the linked library for object_detect