NirCamera.h: 2011-05-03 Jeannie Walldren - Added ShutterOpenCloseTimes()...

NirCamera.h: 2011-05-03 Jeannie Walldren - Added ShutterOpenCloseTimes() method. Updated unitTest to test for new methods. Updated documentation. Replaced Clementine namespace wrap with Isis namespace. Added Isis Disclaimer to files. Added NAIF error check to constructor. 

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2341 41f8697f-d340-4b68-9986-7bafba869bb8