gitignore
tabs2spaces and default value for ros param
moving standard deviation node as utility to examine different imu hardware settings
replaced ros parameters for topic names by default values (can be remapped in launch file) and removed those parameters from existing launch file

http://wiki.ros.org/roslaunch/XML/remap
replaced ros parameters for topic names by default values and replaced those parameters in existing launch file by remaps
calibration_filter: added parameter to control turn on/off calculation of mean and/or std
also turned mean off for magnetometer in launch file
added comments to launch file
tabs2spaces
script to be used to execute arbitrary commands with roslaunch
remove_gravity script and launch file (working)
quaternion.py adapted to provide better workflow with ros