Use isinstance() instead of type() for a typecheck.

Add missing blank line.

tests: match closing bracket for visual identation

Format block comments.

tests: fix comparison with None.

Add missing whitespace.

Fix quantity of blank lines after code object.

utils: remove trailing whitespace

Minor change : Link to MSVC14 Standalone

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

Fix misspellings

msvc fixes