Use msg/srv defined in dynamic_graph_bridge_msgs

Fixes #22

Conflicts:

	include/dynamic_graph_bridge/ros_interpreter.hh
	src/ros_interpreter.cpp
Remove msg/srv generation, correct link with dg_bridge_msgs
Adapt run_command to the extraction of the messages from dynamic_graph_bridge.
Update CMakeLists.txt and package.xml

Some of the library were not generated in the lib folder,
 so linking with the dynamic_graph crashed.
Update the dependencies in packages: the dependency in jrl-dyn-urdf
 does not concern the ros package version anymore.
Include runPythonFile service

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

Correct issue in ubuntu 13.04
Correct signal destruction in rosPublish.

The trigger signal cannot be destroyed.
Correct signal destruction in rosSubscription.
Adapt run_command script to recent changes

Services are in dynamic_graph_bridge_msgs now
Improve run_command script handling

* Check for the existence of the script provided
* Pass an absolute path to the service