AppImage.sh: Use release build, Correct install path
Created by: LNJ2
Originally by @probonopd https://github.com/KaidanIM/Kaidan/issues/141#issuecomment-346896890
Created by: LNJ2
Originally by @probonopd https://github.com/KaidanIM/Kaidan/issues/141#issuecomment-346896890