rtt_rosparam: added operations to get/set all properties with absolute/relative/private namespace
rtt_rosparam: added support for TaskContexts with sub-services
rtt_rosparam: updated operations doc strings
rtt_rosparam: clarification of operation doc strings and updated README.md
rtt_rosparam: do not fail in getParams() if a sub-service cannot be configured from ROS parameters
Merge pull request #7 from meyerj/rtt-rosparam-subservices

rtt_rosparam: Added support for subservices