Fix rmate editing of symlinks

Quick fix to get the size of the target not the size of the symlink. Tested on Ubuntu 12.04, seems to be a well supported ls flag. OS X ( [man ls](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/ls.1.html) ), OpenSolaris ( [man ls](http://www.unix.com/man-page/opensolaris/1/ls/) ) and FreeBSD ( [man ls](http://www.freebsd.org/cgi/man.cgi?query=ls))