Turn on TLS cert generation by default

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Update VBOX_VERSION to 4.3.18

https://www.virtualbox.org/wiki/Changelog
Merge pull request #563 from aanand/turn-on-tls

Turn on TLS and cert generation by default
Merge pull request #567 from rogeriopradoj/patch-1

Update VBOX_VERSION to 4.3.18
Bump to version 1.3.0

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Merge pull request #566 from bfirsh/ship-1.3.0

WIP: Ship 1.3.0
Update README to 1.3.0 (since we missed this in #566)
Add util-linux for nsenter
Add -no-pad not to pad output
Remove TLS support
Remove /etc/rc.d/automount-shares
Merge branch 'refs/heads/no-tls' into yungsang/boot2docker
Merge branch 'refs/heads/no-automount' into yungsang/boot2docker
Add Vagrantfile to build locally