rtt_roscomm: use cmake macros instead of functions as orocos_generate_package() only considers targets within the current scope
rtt_roscomm: removed return() calls from macros as they will return from the calling function or file
rtt_roscomm: fixed cmake SEND_WARNING errors
Merge pull request #7 from meyerj/hydro-devel

Use cmake macros instead of functions in GenerateRTTROSCommPackage.cmake.em