Merge pull request #1 from asilx/master

Merged mod_execution_trace and mod_action_visualization packages into knowrob_addons
moved mod_semantic_map package here from tumros-internal
added stack.xml to knowrob_addons for easier compilation testing
Package with interface KnowRob -- MongoDB log database

Added a first version of a MongoDB interface for KnowRob that can read information from the logged ROS datastructures and compute e.g. an object pose.

The example code defines a computable for the knowrob:orientation property and evaluates this based on the logged turtlesim turtle poses.
Merge remote-tracking branch 'moritz/master'