set matrix elements m_ij as functional properties
reworked semantic map utils: prolog-style predicate names, fixed queries to support multiple maps that are loaded at the same time
updated stack.xml, mentioning Bremen as maintainer
added 'Proprioception' class to be used for representing belief about joint poses
Updated URDF to SRDL converter: do not assert joint poses as fixed any more, but use same structure as for object poses to allow changes over time
Updated robot descriptions to new pose description format
removed warning
updated PR2 description
updated link type reader to also use e.g. <camera> and not just <sensor:camera> tags (somehow URDF has changed silently)
added several classes to knowrob.owl (needed for representation of semantic maps for  RoboEarth)
added object_pose_at_time convenience predicate to read object pose at time T
bugfix in reasoning about object detections: avoid race condition
deactivated build of deprecated comp_cop package
minor changes
removed dependency on vision_srvs, therefore also on ias_common stack
fixed handling of double-values in json_prolog result lists that were truncated to integers before
removed class enum that accidentally got into knowrob.owl
removed duplicate mesh definitions in PR2 model
Merge branch 'master', remote-tracking branch 'origin/master'
updated srdl files