update:fix tabs
UUpdateWidget: add for button Quit action - just close widget, dont app
UUpdateWidget: fix some problems

1. updater folder is created by the updater just when user press "install updates".
2. fix check of checking md5 hash of file. Now downloaded dependent if file is new or no.
Merge branch 'master' of https://github.com/inisider/Nanomite-Updater