1. Support Inplace way for some functions.
2. Add new flexible constructor for XList.
3. Bug fixed.

1. Fix the bugs in backward process.
2. Support the float16 class.
3. Fix bugs.
4. Clean the codes.
5. Remove the makefile.

Support fp16 data type for more operations and fix the minor errors.  (Don't use this! It's an incomplete version)

2. fix the bug of onehotandindex
3. modify the data initilization of transformer
4. add the DumpFormat (need reimplement)

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.

1. add gather function 2. add cross entropy forward computation and backward computation 3. code optimization 4. merge with xiaotong-working branch

1. add macro to implement unary function 2. add sub and div function 3. merge code with the latest branch of xiaotong-working

1) fix the bug of unexpected breakpoints in tensor graph 2) add devID to XTensor constructor 3) avoid unneccessary data allocation in XLink

1. Bug fixed; 2. Support abs, sign, convert data type(float <->int) ;3. Merge with xu and xiao branch