Fix typos and update to 0.4.1 (pytorch#280)

`AT_ASSERT(cond, ...)` -> `AT_ASSERTM(cond, ...)`
https://github.com/pytorch/pytorch/blob/v0.4.1/aten/src/ATen/Error.h#L123

Author: vfdev-5

advanced_source/cpp_extension.rst

@@ -151,7 +151,7 @@ looks as simple as this::
   from torch.utils.cpp_extension import CppExtension, BuildExtension
 
   setup(name='lltm',
-        ext_modules=[CppExtension('lltm', ['lltm.cpp'])]
+        ext_modules=[CppExtension('lltm', ['lltm.cpp'])],
         cmdclass={'build_ext': BuildExtension})
 
 
@@ -662,8 +662,8 @@ We'll start with the C++ file, which we'll call ``lltm_cuda.cpp``, for example:
 
   // C++ interface
 
-  #define CHECK_CUDA(x) AT_ASSERT(x.type().is_cuda(), #x " must be a CUDA tensor")
-  #define CHECK_CONTIGUOUS(x) AT_ASSERT(x.is_contiguous(), #x " must be contiguous")
+  #define CHECK_CUDA(x) AT_ASSERTM(x.type().is_cuda(), #x " must be a CUDA tensor")
+  #define CHECK_CONTIGUOUS(x) AT_ASSERTM(x.is_contiguous(), #x " must be contiguous")
   #define CHECK_INPUT(x) CHECK_CUDA(x); CHECK_CONTIGUOUS(x)
 
   std::vector<at::Tensor> lltm_forward(