Disable *motion* gem names by default

Yes, ironic that the creator of “ProMotion” and co-creator of
“MotionKit” would suggest this, but those were the old days when it was
still cool. ;-)

![screen shot 2014-10-16 at 12 37 47 pm](https://cloud.githubusercontent.com/assets/1479215/4669274/a140812c-556c-11e4-9535-09fcb8452c7f.png)