Fix typo for converting speed to mm/s

Get cmdvel_timeout parameter using older param() method for compatibility with hydro. Should fix issue #54.

LaserPublisher: Don't publish readings with "ignore" flag (usually for fixed robot structure in the way or similar)

Fix dynamic reconfigure defaults, maxes and mins (will be set in node). Don't change odom calibration parameters if parameters don't exist (but they may be set by dynamic_reconfigure or rosparam)

Allow 0 values in odometry calibration parameters, which avoid changing the settings. Set minimum, maximum and defaults for parameters in dynamic_reconfigure. Set better maximums for odometry calibration parameters.

Add watchdog to stop robot if no cmd_vel received

Without this commit, the robot simply continues driving at the speed
from the last received `cmd_vel` message, even if the node that is
supposed to send the `cmd_vel` messages crashes. It is standard behavior
in ROS for robots to stop in this case (at least that's what the PR2 and
every other robot I have worked with so far does).

Remove deprecated tf_prefix. Add parameters to rename each frame id instead, if user wants to do so.

fix includes to also work with aria installed differently by rosdep (with headers in ARia subdirectory)

Conflicts:
	RosAria.cpp

Revert changes to RosAria.cpp made in commit e713805 that caused regression affecting sonar pointcloud2 topic

This reverts commit d7138059, reversing
changes made to eed89e26.

This reverts commit a1f5de07.

Conflicts:
	RosAria.cpp

use CMake find_package macro to find Aria headers, if not found, fallback to previous check for /usr/local/Aria installation.

Decided to publish second sonar_pointcloud2 topic instead of having a parameter that switches type of sonar topic, so it can be used both ways at runtime