remove trailing white-spaces from test/unit/tracker_test.rb.
remove trailing white-spaces from test/unit/user_preference_test.rb.
Rails3: replace deprecated 'before_save' method at Attachment model.
remove trailing white-spaces from test/unit/version_test.rb.
remove trailing white-spaces from test/unit/watcher_test.rb.
remove trailing white-spaces from test/unit/member_test.rb.
remove trailing white-spaces from test/unit/time_entry_test.rb.
remove trailing white-spaces from test/unit/token_test.rb.
remove trailing white-spaces from test/unit/issue_nested_set_test.rb.
remove trailing white-spaces from test/unit/issue_priority_test.rb.
