costmap_2d: tf_prefix support in obstacle_layer
costmap2d: only prefix sensor_frame when it's not empty
prevent div by zero in raytraceLine
Merge pull request #263 from artivis/floating_point_div_zero

prevent div by zero in raytraceLine
deallocates costmap_ before reallocating
Merge pull request #266 from efernandez/costmap2d_resize_memory_leak

Call deleteMaps before initMaps
Added waitForTransform to bufferCloud to solve extrapolation into the future exception
Merge pull request #270 from pronobis/hydro-devel

Added waitForTransform to solve extrapolation into the future exception
Merge pull request #258 from clearpathrobotics/obstaclelayer-tf-prefix

costmap_2d: tf_prefix support in obstacle_layer
Fixed setting child_frame_id in base_local_planner::OdometryHelperRos
Merge pull request #272 from clearpathrobotics/baselplanner-vel-frame-fix

Fixed setting child_frame_id in base_local_planner::OdometryHelperRos
remove undefined function updateUsingPlugins
style fixes for layer headers
style fixes for static_layer
style fixes, get rid of using namespace std
update docs in layer.h
style updates
update include guard style
Merge pull request #273 from mikeferguson/hydro-devel

Style fixes, remove undefined function, future proof use of std::
reset the voxel grid as part of updateOrigin