Adding an note to the CONTRIBUTORS file for mis-attributed author commits

Due to the author mis-namings that stemmed from the conversion from
SVN/SourceForge to Git/GitHub, this commit flags those contributors
who were mis-named during the conversion process in order to set
the record straight where we give credit to past contributors.
Merge pull request #636 from bradcray/contributors-misattributed

Adding an note to the CONTRIBUTORS file for mis-attributed authors

Due to the author mis-namings that stemmed from the conversion from
SVN/SourceForge to Git/GitHub, this commit flags those contributors
who were mis-named during the conversion process in order to set
the record straight where we give credit to past contributors.