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*

It looks like you're looking for multiple teams in any case.
Please include a check like ```page.has_content?"Select your Team"``` or something which only is displayed when being asked for the team.