added polar scan matcher
added correct license and references to PSM and CSM

Conflicts:

	canonical_scan_matcher/include/canonical_scan_matcher/csm_node.h
	canonical_scan_matcher/src/csm_node.cpp
added imu option to PSM, made CSM and PSM look similar

Conflicts:

	canonical_scan_matcher/include/canonical_scan_matcher/csm_node.h
	canonical_scan_matcher/src/csm_node.cpp
added demo dir to CSM, fixed PSM launch file
clean up: remove csm
updated launch files and rviz configs, removed old GPL files
equivalent to the one relavant line in the massive, unrelated patch filxr/scan_tools@6a6638318e066db0118eaf9982a19adc02c07a08
added reference in manifest of psm
Include an updated polar_scan_matcher, updated to work on Hydro
Merge pull request #14 from daxtens/feature/polar_scan_matcher

Updated polar scan matcher