Faulty svn commandline is generated for passwords containing special chars

If i use a svn password containing a semicolon with the maven-scm-provider-svnexe, the commandline generated by SvnCommandlineUtils is faulty, because
the password is not quoted. Passwords containing other special chars might cause problems too.

Solution: Enclosing the password for the commandline in single quotes solves this problem.
I have attached a patch for SvnCommandlineUtils that fixes this issue.