Update rails and ruby versions provided with box

```bash
ruaction@librario-19049:~$ ruby -v                                                                                                                                                                               
ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux]                                                                                                                                                        

action@librario-19049:~$ gem list activemodel                                                                                                                                                                    
                                                                                                                                                                                                                 
*** LOCAL GEMS ***                                                                                                                                                                                               
                                                                                                                                                                                                                 
activemodel (4.0.0, 3.2.14)                                                                                                                                                                                      
```

Side note: I installed rails 3.2.14