[wip/dynamic-graph-bridge] Release 2.0.0

robotpkg :
patch-aa, patch-ac : update without modif (need to test if always needed)
patch-ab : deleted, has been integrated in the release
patch-ad : dont know how to use rospack inside robotpkg, need to investigate

Release 2.0.0

* Merge pull request #25 from stack-of-tasks/hydro
* Reflect new messages with dynamic_graph_bridge_msgs catkinization.
* Correct signal destruction in rosSubscription.
* Correct signal destruction in rosPublish.
* Add missing dependency in dl.
* Include runPythonFile service
* Update CMakeLists.txt and package.xml
* Adapt run_command to the extraction of the messages from dynamic_graph_bridge.
* Remove msg/srv generation, correct link with dg_bridge_msgs
* Use msg/srv defined in dynamic_graph_bridge_msgs
* Correct rosPublish.rm method.
* Synchronize.
* Merge pull request #20 from aclodic/master
* Update CMakeLists.txt to install libros_bridge