Removed NodeHandle from Operator constructor.
Lock costmap before accessing it.
Moved lock out of the action evaluation loop.
Do not delete the Costmap2DROS, seems to be a problem.
Fixed a bug that would delete MoveActionServer twice...
Fixed tutorial visualization.
Added nav2d_exploration.
ExplorationPlugins working.
Delete ExplorationPlanner in destructor.
Removed navigation_2d
Changed manifest.