Fix hardcoded line endings

A little change that makes the script compatible with the Windows
Subversion binary, which uses `\r\n` rather than `\n` line endings as it
does on Unix. With this change I had no problem using the tool under
Windows (once I complied with the Python 2.* requirement that is).

Should not break Unix compatibility; rather makes the script more OS-independent.

For completeness also added is a revprop change Windows example to perhaps save users a Google search.