Merge pull request #23 from valeRB/master

Changed Save function
Merge pull request #24 from valeRB/master

A change in save function
wall value of costmap now is 150
Merge pull request #25 from qiqiapple/master

wall value of costmap now is 150
Save another bag with 2 topics
change to launch file
Merge branch 'master' of https://github.com/RoboGroup3/mapping
Merge pull request #8 from RoboGroup3/master

Merge