sot_laoder: calls the real time control loop after initializeRosNode.

with filling sensor, control computation and sending control.

This enables to directly launch a python file within any roslaunch file
Adapted by F.Keith for the extraction of the messages.

Fixes #22

Conflicts:

	include/dynamic_graph_bridge/ros_interpreter.hh
	src/ros_interpreter.cpp

  Launching an application in a roslaunch file may cause to send python
  command before the interpreter has read the prologue. This commit should fix
  this issue.

Pb: The openrtm architecture loads a shared library to implement the services of
an OpenRTM node. The scheduling properties are ensured by the operating system
running openrtm. Then on the robot, when the shared library is loaded it is
run inside the real-time loop. As sot-hrp-2 was creating the interpreter and
the ros-node in the constructor this used to break HRP-2 real-time OS.

This commit change the initialization of the ros-node to use a multi-threaded
spinner. Then ros calls are handled in a seperate non-realtime thread.