replace resource.rs with new http-entity crate

This crate is a slightly-more-polished and MIT-licensed version of
resource.rs. So far it has one advantage: running the tests doesn't
require RUST_TEST_THREADS=1.

src/main.rs

@@ -38,6 +38,7 @@ extern crate docopt;
 #[macro_use] extern crate ffmpeg;
 extern crate ffmpeg_sys;
 extern crate fnv;
+extern crate http_entity;
 extern crate hyper;
 #[macro_use] extern crate lazy_static;
 extern crate libc;
@@ -76,7 +77,6 @@ mod mmapfile;
 mod mp4;
 mod pieces;
 mod recording;
-mod resource;
 mod stream;
 mod streamer;
 mod strutil;