[ml] Modified things in leg_detector to enable parameterization of laser_scan_topic. Also changed leg_detector's manifest to update to fuerte
[ml] Modifies gitignore to not include .bk_original files
[ml] Huge update to leg_detector to fix output, sends only single measurement for a matching leg pair, and separates declaration and implementation of defined classes into header and cpp files
[ml] Changes to people_tracking_filter package to add comments and fix output for the tracking filter.