Add the new link to "Microsoft Visual C++ Build Tools" if MSVC14 is not installed.

Fix misspellings

msvc fixes

Fixes : 
- Bad argument name
- Better Python 2 compatibility

Improved support for MSVC discovery

Reindent to avoid raw strings and hanging indents. Let os.path.join provide the backslash characters.

Don't use deprecated 'U' flag to read manifest

The universal newlines mode ('U' flag) is deprecated since Python
3.4. It only replaces "\r\n" with "\n", but it doesn't split lines at
"\r" (Mac newline). In practice, the flag was useless, the
sdist.read_manifest() method already uses line.strip() and so removes
newline characters.

readme: update links to documentation

Issue #593 and other fixes