Removed jsyeo's dev gems. Removed unused gems.

![lol](https://lh4.googleusercontent.com/-WDENMs9-9Go/UIpQ8VtoPnI/AAAAAAAAGlw/DlGT87t_eKU/s350/123.gif)
Different projects have different needs, so sometimes I am on projects who uses debugger and some on pry. and I don't like mixing my gems into the global namespace. :)