single and double quotes on windows should be escaped with carret

when remote call is to Windows OS is invoked, the command being sent has path value escaped with backslash like the example below:

winrs -r:remotehost.com "drush.bat --uri=http://remotehost.com/drupal --root=\"C:\\\\inetpub\\\\wwwroot\\\\drupal\" status"

This does not work as quotes should be escaped with carret symbol (^). So the corresponding command should like the following:

winrs -r:remotehost.com "drush.bat --uri=http://remotehost.com/drupal --root=^"C:\\\\inetpub\\\\wwwroot\\\\drupal^" status"

Attached patch escapes single and double quotes with carret character on Windows OS.

I am not sure how this will affect the rest of the escaping calls but it seems to work fine.