Moved newrelic recipe out of the ruby block 

It was breaking the newrelic recipe (failing to install a package because include newrelic::repository was not working).
http://pastebin.com/pyMBurNv

I can definitely reproduce the issue when I'm integrating Pythonstack::newrelic=>platformstack::default.

I ran kitchen after this change : 
```
 |2.0.0-p481| MN4G0JG3QC in ~/chef/platformstack
→ kitchen list
Instance             Driver   Provisioner  Last Action
default-ubuntu-1204  Vagrant  ChefZero     Verified
default-centos-65    Vagrant  ChefZero     Verified
```

I don't think it is useful to put newrelic inside the rubyblock. So it should be fine.