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It seems that the tutorials missed a crucial step. Before you are able to use your ROS package you need to build the workspace and also source the generated setup file. This will especially add you source folder to the ROS_PACKAGE_PATH.

I have updated the tutorial: http://wiki.ros.org/action/diff/ROS/Tutorials/catkin/CreatingPackage?action=diff&rev1=25&rev2=26

Please try it with the newly added step: http://wiki.ros.org/ROS/Tutorials/CreatingPackage#ROS.2BAC8-Tutorials.2BAC8-catkin.2BAC8-CreatingPackage.Building_a_catkin_workspace_and_sourcing_the_setup_file

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