simplify locate_repos
get user input about using Dropbox

On branch master
Changes to be committed:

	modified:   includes/linuxkm.lib
	modified:   init.sh
	modified:   scripts/server_ssh.sh
	modified:   setup.sh
update function library
add Dropbox install
make gpg_key optional for rpm installs

On branch master
Changes to be committed:

	modified:   includes/linuxkm.lib
	modified:   scripts/lemp.sh
	modified:   scripts/linux_update.sh
	modified:   setup.sh