Add attributes for rustdoc

/.rust/

/doc/

#[feature(struct_variant)];

// Needed for rustdoc-ng

#[link(name="rust-ssl", vers="0.1",

       package_id="github.com/sfackler/rust-ssl")];

#[doc(html_root_url="http://docs.octayn.net/rust-ssl/")];

use std::cast;

use std::libc::{c_int, c_void};

use std::ptr;