Added support for YAML-CPP 0.5+.

The new yaml-cpp API removes the "node >> outputvar;" operator, and it
has a new way of loading documents. There's no version hint in the
library's headers, so I'm getting the version number from pkg-config.
Merge pull request #5 from piyushk/master

it is now necessary to specify noise for a sensor, otherwise the camera ...
Merge pull request #3 from cottsay/master

Add support for YAML-CPP 0.5+.
cleaned up most catkin_lint warnings. closes #6