style fix

![addmargin](https://cloud.githubusercontent.com/assets/5292321/4904840/b3ae9bcc-644a-11e4-984e-321d0ad62e60.png)

I think this solution will be better:

`.ap-container .ap-participants-list li {
    margin-bottom: 5px;
}`
cause ap-inline-list class is used in many places