Removed empty line
Fixed deleting rbinded filesystems
Fixed archive unpack issue
Fixed isolinux.cfg install
Shell Default zsh

Changes root shell to zsh and default shell for new users (using
useradd) to zsh.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'

Conflicts:
	build.sh
etc-update replacement

Fixes etc-update to not ask for confirmation to mv/cp/rm .cfg files
Merge pull request #16 from Zaexu/master

etc-update replacement