add timer to test function call
10000iter
move profiling into layer class
Working benchmark
better digit format
corrected
modify CI calculation, but remain to be determined
Correted calculation of CI. Move profiling code into 'forward_batch'
use bandwidth instead of throughput to calculate performance
add new kernel
100 samples, batch_size 10, without profiling
100 samples, batch_size 20, without profiling
profiling a batch of size 10
Switched to Mac
Merge branch 'opencl_support' into GPU, swith to Mac

Conflicts:
	convnet/util.h
Merge branch 'GPU' of https://github.com/HugoFeng/convnet into GPU

Conflicts:
	convnet/util.h
Merge branch 'GPU' into shared_mem, use Mac

Conflicts:
	convnet/convolutional_layer.h
	convnet/main.cpp
	convnet/util.h