make manager calls nmake /F Makefile.win on Windows
Merge pull request #2426 from chyndman/mix-make-manager-win-nmake

make manager calls nmake /F Makefile.win on Windows
Check if Makefile.win is available before running nmake
Fix typo in deriving docs
Merge pull request #2428 from knewter/feature/deriving_typofix

Fix typo in deriving docs