edit makefile for matcaffe:
	修改：      Makefile
	删除：      examples/imagenet/create_imagenet.sh
	删除：      examples/imagenet/imagenet_solver.prototxt
	删除：      examples/mnist/lenet_solver.prototxt

fix the bug of invalid configuration argument, restrict max num of
blocks:
	修改：      include/caffe/common.hpp
	修改：      src/caffe/common.cpp

edit max file numbers which leveldb can open, solve the bug of heavy
load of memory:
	修改：      src/caffe/layers/data_layer.cpp