Install PyTorch v1.0.0 from source on Windows 10

Based on the information from the following links:

• Instructions at PyTorch github repository
• MS Visual Studio-specific instructions for toolsets

Note that we need to set "VS150COMNTOOLS" to "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\vsdevcmd\ext" (instead of "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Auxiliary\Build").