Create navigation package

[matthewia94]

package: navigation
node: N/A

This will be an empty package where navigation nodes will be placed.

[Sanfan1]

https://github.com/swri-robotics/gps_umd
I have found this GPS code for ROS, but I don't understand it very well.

[Sanfan1]

http://wiki.ros.org/gps_common
This is a link to their wiki page