Removed jsyeo's dev gems. Removed unused gems.

![lol](https://lh4.googleusercontent.com/-WDENMs9-9Go/UIpQ8VtoPnI/AAAAAAAAGlw/DlGT87t_eKU/s350/123.gif)
spring, however, is damned useful. it preloads Rails in memory. you most likely want to keep it...