Change list parameter from IdStr to ownerScreenName and slug

I noticed `:list $aa` is not a clever, Because $XX is given to different combinations each time.
That is why :octocat:  I think `:list screen_name/list_name` is the better way. 
(This way is not need to run `:lists` if you remember FullName of your favorite list)

![screen shot 2014-09-13 at 11 27 32 am](https://cloud.githubusercontent.com/assets/3464295/4259452/a188bbda-3af6-11e4-9f6d-674227edbbe2.png)

 lists/statuses API doesn't have ownerScreenName attribute, so I need to modify FullName using `SplitN(FullName)` and `FullName[1:]` :crying_cat_face: