ruby now crashes on ctrl-d

irb crashes when I end a session with ctrl-d

```
tomb@localhost:~$ which irb
/home/tomb/.rvm/rubies/ruby-2.1.5/bin/irb
tomb@localhost:~$ uname -a
Linux localhost 3.18.5-x86_64-linode52 #1 SMP Thu Feb 5 12:18:36 EST 2015 x86_64 x86_64 x86_64 GNU/Linux
```
