prepare public key for login via ssh

in reference to
https://github.com/jedi4ever/veewee/blob/master/templates/Debian-7.1.0-amd64-netboot/vagrant.sh
execute shell for provisioning in the build
include curl as default library
Merge branch '#16' into #15

fix #16
shutdown vm gracefully
sudo without password

in reference to
https://github.com/jedi4ever/veewee/blob/master/templates/Debian-7.1.0-amd64-netboot/base.sh
execute 'base.sh' for provisioning in the build
Merge branch '#18' into #17

fix #18
Merge branch '#17' into #15

fix #17
Merge branch '#15'

fix #15