travis updates for Windows deploy
Change zip file name from NetHack.zip
to
NetHack-x86-beta$TRAVIS_TAG.zip
where $TRAVIS_TAG represents the tag info.
Also, log the commands from the sh script in win/win32/vs2017 to the build log.
Moved the travis visual studio build bash script to live outside of
the travis YML file. Updated the script to use powershell to generate
ZIP file form the binary results.
Deploy Windows build ZIP file to github releases if build has commit
has been tagged. Build will be marked pre-release.
