update setup instructions

update README: add run "vagrant init" and "dice log"
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You need to run "vagrant init" in the directory where you have the
recipe since dice expects to find the Vagrantfile there.

You can run "dice log" at the end to see the progress of the build.

review defaults in Dicefile for 13.2 recipes
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defaults should be using vagrant boxes. Otherwise, the README
instructions are wrong.

I've just copied 13.2 recipe Dicefile from 13.1 which looked good
partial fix for issue #3 : dice ssh command

This commit adds the "dice ssh" command only for vagrant workers.

It misses tests
add test for ssh command and fix vagrant test setup

partial fix for issue #3
Merge branch 'dice_ssh_command' of github.com:jordimassaguerpla/dice into dice_ssh_command

* 'dice_ssh_command' of github.com:jordimassaguerpla/dice:
  partial fix for issue #3 : dice ssh command