Support Python 3.4 on Windows?

[emmatyping]

I recently made the changes needed to typed_ast (see python/typed_ast#47) for VS 2010 compilation support, so that Python 3.3 and 3.4 work on Windows, for typed_ast and mypy.

The only other issue with support for these Python versions on Windows is lxml, which provides a wheel for 3.4 32 bit, but not 64 bit (this seems to be an oversight, I plan on filing a bug report). Wheels for 3.3 are provided.

I don't think it make sense to add support for 3.3 since its EOL is in just over 2 months.

For reference 3.4's EOL is in 2019.

[ilinum]

We should also remove our dependency on lxml altogether but this is a complicated task (#909).

[JelleZijlstra]

lxml isn't actually an installation dependency though, since it's used only for a report. Perhaps we should support 3.4 on Windows except for the lxml report, which most users probably don't need anyway.

[emmatyping]

I think that would be okay. And if someone tries to use it they will get an import error and install it themselves, so I don't see it as a problem.

[emmatyping]

python/typed_ast#47 was just merged so I will make a PR with a note about the lxml on Windows issue.. I need to wait for a typed_ast release.

[emmatyping]

We now support this, so Im closing.