Following installation on windows, running grunt provides error:
Error: The libsass binding was not found
\node_modules\patternpack\node_modules\grunt-sass\node_modules\node-sass\vendor\win32-ia32-11\binding.node

However my system is 64 bit:
\node_modules\patternpack\node_modules\grunt-sass\node_modules\node-sass\vendor\win32-x64-46\binding.node