open files in binary mode in unit test web server (may fix some issues on windows)
open files in binary mode in unit test web server (may fix some issues on windows)

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@9581 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk