CPU code update for Windows.

# Conflicts:
#	source/tensor/XDevice.cpp
#	source/tensor/XMem.cpp
#	source/tensor/XTensor.cpp

2. Merge with Xiao branch.

2. Add MemManager class to manage the memory;
3. Use the new version XList;
4. Add a new interface to create Tensor;
5. Apply MemManager to FNNLM.