Merge pull request #36 from hatguy/indigo-devel

Indigo devel - experiment playback
refactored mongodb interface to use non-ROS-message-classes for Prolog interface
added constructor to tfjava.Stamped using POSIX timestamps instead of ROS times
added dependency of knowrob_mongo on knowrob_srdl
added dependency on std_msgs to load the class definitions for ros.Time
fixed diagram publishing