replaced sha1 hash algorithm with sha256 hash algorithm to support Shibboleth Identity Provider version 3
replaced sha1 hash algorithm with sha256 hash algorithm to support Shibboleth Identity Provider version 3

mkoon/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development,mkoon/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development