- track_unknown_space parameter added to obstacle layer in costmap_common_param.yaml
- set allow_unknown global path planning to false and added note about needed track_unkown_space param
Update move_base_params.yaml

Removed base_global_planner parameter which was defined twice
Added comment about track_unknown_space also to global_planner_param.yaml
Merge branch 'alex_dev' of https://github.com/mehditlili/turtlebot_apps into alex_dev
Merge pull request #122 from mehditlili/alex_dev

Fix for allow unknown / track_unkown_space added