Add pre and post install script calls (#800)
Add pre and post install script calls (#800)

* fix tgz glob for powershell build (echo #729 fix)

* add pre and post install script calls, and wrap prepub in ifdev

troydemonbreun/yarn,troydemonbreun/yarn,lawliet89/yarn,lawliet89/yarn,bsansouci/esy,MiguelAlho/yarn,mvestergaard/yarn,onemen/yarn,mourner/yarn,dguo/yarn,seripap/emojiless-yarn,andreypopp/esy,CHECK24/yarn,ConAntonakos/yarn,bsansouci/esy,dguo/yarn,FLGMwt/yarn,joeyespo/yarn,mvestergaard/yarn,dxu/yarn,mgcrea/yarn,CHECK24/yarn,mourner/yarn,ConAntonakos/yarn,mgcrea/yarn,kasperlewau/yarn,suitupalex/yarn,onemen/yarn,kasperlewau/yarn,MiguelAlho/yarn,seripap/emojiless-yarn,andreypopp/esy,andreypopp/esy,bsansouci/esy,joeyespo/yarn,dxu/yarn,suitupalex/yarn,FLGMwt/yarn