Add travis and coverage status to sot-romeo package.

README.md

 sot-romeo
 ===========
 
+[![Build Status](https://travis-ci.org/stack-of-tasks/sot-romeo.png?branch=master)](https://travis-ci.org/stack-of-tasks/sot-romeo)
+[![Coverage Status](https://coveralls.io/repos/stack-of-tasks/sot-romeo/badge.png)](https://coveralls.io/r/stack-of-tasks/sot-romeo)
+
 This packages provides a generic Stack Of Tasks library
 for the humanoid robot Romeo.