Adding Swap to Vaprobash

- See #338
- Adds optional Swap to the Vagrant box using a new variable called `server_swap`. Set it to `false` if you don't want any Swap.
- Will fix #336
Merge pull request #342 from Ilyes512/add-swap

Adding Swap to Vaprobash
Merge branch 'develop'
Merge branch 'master' into theand1404

Conflicts:
	Vagrantfile