Fix Windows installation and testing

[aarondettmann]

• Update documentation with instructions for installations on Windows.
• Add Windows tests on TravisCI.

Related issues:

• 12

[aarondettmann]

Automated testing on TravisCI put on hold for now. The Miniconda installer times out.

https://github.com/airinnova/pytornado/blob/2f890185adf47ae0d6726d0816dc24cf0b442945/.travis.yml#L36

Manual testing can still be done, if Windows system is available.

[aarondettmann]

• Manual testing done. PyTornado can be installed and run on Windows 10.
• Automated testing on TravisCI still to be implemented.