Making one step towards role tidiness, APT cache update, solving issue #15

Bunch of things still left to improve.
Tested successfully on:
```bash

[dvaida@scat ]$ vagrant --version
Vagrant 1.5.4

[dvaida@scat ]$ VBoxManage --version
4.3.18r96516

[dvaida@scat ]$ ansible --version
ansible 1.8 (devel 7cd5b13e34) last updated 2014/11/03 12:03:20 (GMT +200)

root@wheezy:/home/vagrant# cat /etc/issue
Debian GNU/Linux 7 \n \l

root@wheezy:/home/vagrant# uname -a
Linux wheezy.vagrant 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3+deb7u1 x86_64 GNU/Linux
root@wheezy:/home/vagrant#
```