Feature/msvc-discovery

README and CHANGES were renamed. Update MANIFEST.in to include them once again in the source distributions. Fixes #575.

After testing VC Builds Tools 2015 with current = Amd64 and target = Amd64, x86, Arm

Feature/msvc discovery

Tests advancement:

I tested WinSDK 7.1, WinSDK 7.0, WinSDK 6.1, VC for Python 2.7 with current arch as X86 and all possible target architecture. Environment generated from script is good for all (With some little fixes in this commit), some path are add on some case, I will look if I need to remove them. I need also to check .Net Framework 64bit in this case.

I need also to do test for sames compilers on X64 architecture, I will also test MSVC++ 2015 Build tools on X64.

I looked for create automated test on AppVeyor for this, but it is impossible to only have one of theses compilers only installed... So I did all test manually.

Feature/msvc discovery

Feature/msvc discovery

Fix setuptools url and curl wants --location to follow redirects

This change also removes:

    sys.meta_path = [importer for importer in sys.meta_path if
                     importer.__class__.__module__ != 'pkg_resources.extern']

from _unload_pkg_resources.

These lines were removed from the version at: https://bootstrap.pypa.io/ez_setup.py

I don't know why the code there and here differs.

password prompt on upload command

Update packaging to 16.7

This adds support for the deprecated python_implementation marker
which was an undocumented setuptools marker prior to 20.2 in
addition to the newer markers.

The upload command wasn't prompting for a password. If there was no
password specified in ~/.pypirc, the upload command,
    python setup.py sdist upload
would fail and raise a TypeError. The workaround for this was to use
    python setup.py sdist register upload
since the register command does prompt for a password.

This commit ensures that the upload command prompts for a password
if not given one by ~/.pypirc or the register command.