Removing white spaces
Removing public annotation from private methods
Correcting commands list
Adding get_rgb to be used instead of user_led

user_led was returning something like:
{"result":"#<Sphero::Response::GetRGB:0x007fed829a2640>"}

This new method returns an array of RGB values…
Merge branch 'master' of github.com:hybridgroup/artoo-sphero into get_rgb

* 'master' of github.com:hybridgroup/artoo-sphero:
Updating method doc
Returning nil in get_rgb if object nil from user_led
Sending persitant flag=true in set_color

When using rgb method to set sphero color, persistant flag
needs to be true so the value of user_led is saved and sphero color
can be retrieved by using user_led method.
Merge pull request #16 from hybridgroup/get_rgb

Get rgb method addition