(doc) Added rustdoc for alloy module.
(doc) Added rustdoc for furnace module.
(doc) Added rustdoc for ingot module.
(doc) Added rustdoc for iron module.
(doc) Added rustdoc for request module.
(doc) Added rustdoc for response module.
(doc) Fixed formatting in lib.rs
(doc) Response/Request generic traits.
(doc) IronResponse/IronRequest.
(doc) IronResponse::from_http.
(doc) Alloy.
Merge pull request #45 from iron/doc/doc-all

(doc) Documented many modules.