Added missed test dependencies to rosunit. Fix #205
Reworded error displayed when joints cannot be found Fix #180
Fixed issue with urdfdom headers
Make building unit tests for client and utils conditional. Fix #171.
Switched to urdf::*SharedPtr instead of boost::shared_ptr to stay compatible.
Contributors: Dmitry Rozhkov, G.A. vd. Hoorn, Jochen Sprickerhof, Levi Armstrong, Nadia Hammoudeh GarcĂa, Shaun Edwards, ridhwanluthra