Documentation icon cfg hint for rustdoc

Author: 9prady9

src/lib.rs

@@ -1,3 +1,7 @@
+#![doc(html_logo_url = "http://www.arrayfire.com/logos/arrayfire_logo_symbol.png",
+       html_favicon_url = "http://www.rust-lang.org/favicon.ico",
+       html_root_url = "http://arrayfire.com/docs/rust")]
+
 pub use array::Array;
 pub use array::{print};
 mod array;