fix nightly build (fixes #148)

I guess route-recognizer is no longer maintained? My PR:
http-rs/route-recognizer#25
Comment from Alex Crichton:
http-rs/route-recognizer#26 (comment)

Author: miller-time

Cargo.toml

@@ -13,3 +13,7 @@ keywords = ["iron", "web", "http", "routing", "router"]
 route-recognizer = "0.1"
 iron = { git = "https://github.com/iron/iron", branch = "master" }
 url = "1.1"
+
+[patch.crates-io.route-recognizer]
+git = "https://github.com/miller-time/route-recognizer.rs"
+rev = "d7bc06d2dc58a2c59d8f2cfbee2ab23b8188700d"