Add the internal dependencies between the projects.
Correct link with boost.
Remove dependency to Bullet
Look for Bullet as a system dependency
Disable non-standard dependencies for now.
add support for unsigned int values import/export (close #2)
Fixes #4

Retry the command (one time only) if the connection was lost
Fixes #5

Reimplement runsource to reset the cache in case of SyntaxError

Behaviour of runsource based on:
http://docs.python.org/2/library/code.html
Call RosShell runcode instead of parent class
Rename ros_import into ros_publish, and ros_export into ros_subscribe.

The old names are kept for now, but will disappear in the
future.
Merge https://github.com/stack-of-tasks/dynamic_graph_bridge

Conflicts:
	CMakeLists.txt