Adds ability to select team.

Closes #4 

@KrauseFx Please check if this matches your code standards (if not feel free to change anything or throw it out the window as you prefer :wink: 
Also maybe this could benefit from receiving the team as an option(?).

Right now I'm showing the list of teams so its easier for the user to select which one they want to manipulate.
See example below:
![screen_shot_2014-11-26_at_23_13_15](https://cloud.githubusercontent.com/assets/2642850/5212611/119f6788-75c2-11e4-8822-4123cc35b270.jpg)

*Edit: Forgot to mention; I modified the README although did not add a shoutout, don't know if you are used to that*

@esttorhe Is there a reason you put that outside of the ```begin-rescue``` block?