Update link in README

Signed-off-by: John Else <john.else@citrix.com>
Update .merlin

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #13 from johnelse/tidying

Update README and .merlin
Pull xen-gnt.unix dependency into the main library

That way, programs linking against rrd-transport won't have to
explicitly pull in xen-gnt.unix.

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #14 from johnelse/fix-build-deps

Pull xen-gnt.unix dependency into the main library