This fixes the following issues when using the provided Vagrantfile
that can be used to develop Vagrant.
* use -s for curl
* set a hostname
* set the config.ssh.shell in the development Vagrantfile
==> default: stdin: is not a tty
* export the DEBIAN_FRONTEND variable
==> default: dpkg-preconfigure: unable to re-open stdin: No such file or
directory
* import the mpapis public key to verify downloaded release
==> default: -su: rvm: command not found
* use official Ubuntu Trusty box
New release '14.04.2 LTS' available.
Mitchell Hashimoto
Seth Vargo
Christian Berendt