Fixed issue #20

My system does not have sendfile so I can't test it, but theoretically this will work. (I followed this example: http://www.informit.com/articles/article.aspx?p=23618&seqNum=13)
This seems wrong. You need ``sendfile`` in ``libtocc``, but you put the check on configure script of ``cli``. I think that's why you couldn't test it.