Created by: fuyw

Done

1. Solve some bugs for Windows compatibility.
2. xparl start and xparl connect commands works fine.
3. Successfully run A2C examples on Windows 10, Python 3.5.

TODO

1. There is no commands like ps -ef | grep xxx on windows, the tasklist | findstr xxx commands on Windows doesn't provide enough information. And the taskkill /F /IM "python.exe" command is too brutal. Threrefore, xparl status and xparl stop commands still can not be used.

2. multiprocessing is very different on Windows, and this will lead to some failures in the unittest.

3. timeout_decorator is not support on the Windows 10.