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

Support reserved property in XTensor to indicate whether the data is reserved for backward.

Fix the minor bugs in IsSameShaped.

Fix the minor bugs in Transformer.

Find some fp16 bugs during decoding NMT system. We decide to roll back some codes to the last version. These codes need to be reviewed.

1. Update the installing methods in manual.
2. Remove the traditional installing way of Windows in manual.
3. Fix the bugs in CMake.

Find some bugs during training NMT system. We decide to roll back some codes to the last version. These codes need to be reviewed.

Support to check whether to compile half precision parts in CUDA codes.

Fix the __half bugs in SetData.

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

Merge with the branch of xuchen (NOT update the float16, this needs code review) and fix the bugs in Gather function.
1. Support Reciprocal fucntion.
2. Fix the safe delete bugs in XDevice.
3. Support new API to convert the data type of tensor.
4. Support to show the memory usage of buffer memory.
5. Fix minor errors.

Fix minor errors.