start to work on the back propagate part of convnet
add cifar-10.c
added back propagation for convolutional and full connect, haven't tested
modified bbfdetect to utilize OpenMP
added a test picture
edge detection slice and merge (optimization needed)
cleaned the code (still not clean = =)
everything works, except the merge has several error pixels
cleanup
save
fold the nested loops in bbfdetect
fixed the var decl error