Issue with escaping space - space in src or dest

[MarshallRJ]

It seems that the spaces in a path with a space - space are being escaped incorrectly.

eg path "/foo/bar - test.txt"

was being sent to rysnc as: "/foo/bar\ - test.txt"

and not as expected: "/foo/bar\ -\ test.txt"

I added a test and proposed an fix to the escape regex:

#55