release version 2.2 on 2012-10-08_15-39-52
	new file:   CMakeLists.txt
	new file:   cMake/FindEigen3.cmake
release version 2.2.1 on 2012-11-13_14-51-35
release version 2.2.2 on 2012-11-14_08-28-32
release version 2.2.3 on 2012-11-29_23-38-14
Merge with upstream.