Rename librusthttpserver to libhttp.

--HG--
rename : src/librusthttpserver/buffer.rs => src/libhttp/buffer.rs
rename : src/librusthttpserver/codegen/branchify.rs => src/libhttp/codegen/branchify.rs
rename : src/librusthttpserver/codegen/codegen.rs => src/libhttp/codegen/codegen.rs
rename : src/librusthttpserver/codegen/read_method.rs => src/libhttp/codegen/read_method.rs
rename : src/librusthttpserver/codegen/status.rs => src/libhttp/codegen/status.rs
rename : src/librusthttpserver/headers.rs => src/libhttp/headers.rs
rename : src/librusthttpserver/rusthttpserver.rs => src/libhttp/lib.rs
rename : src/librusthttpserver/method.rs => src/libhttp/method.rs
rename : src/librusthttpserver/request.old.rs => src/libhttp/request.old.rs
rename : src/librusthttpserver/request.rs => src/libhttp/request.rs
rename : src/librusthttpserver/response.rs => src/libhttp/response.rs
rename : src/librusthttpserver/rfc2616.rs => src/libhttp/rfc2616.rs
rename : src/librusthttpserver/server.rs => src/libhttp/server.rs
Scrap the old (unused) request reader.
Fix http crate link name.
Update ignore rules to use libhttp name.