Merge pull request #15 from davetcoleman/master

Fixed PLUGINLIB_DECLARE_CLASS depreacated errors
Merge pull request #16 from davetcoleman/master

Fixed control_toolbox deprecated errors with updatePid()
Fix package URL in package.xml
Merge pull request #18 from pal-robotics/master

Fix package URLs in package.xml
Make command additive inverse with sign change