Encrypted folders and NFS

Maybe it should go into the wiki or a FAQ page, I'll let you decide. It's a small note about NFS not working on encrypted partition. Ubuntu offers to encrypt home directory on install. When doing a vagrant up, the NFS gives this weird error : 
```
Mounting NFS shared folders failed. This is most often caused by the NFS
client software not being installed on the guest machine. Please verify
that the NFS client software is properly installed, and consult any resources
specific to the linux distro you're using for more information on how to
do this.
```


Installing the project on an unencrypted partition works fine.