adding example output files from previous versions of darshan

git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@271 3b7491f3-a168-0410-bf4b-c445ed680a29

example-output/README.txt

+Example output files from previous versions of darshan.  In some cases the
+target system (surveyor @ ANL) had an incorrect clock at the time that these
+samples were collected.