RFC 73 - Unsafe API locations

Author: alexcrichton

active/0000-unsafe-api-location.md renamed to active/0073-unsafe-api-location.md

@@ -1,6 +1,6 @@
-- Start Date: (fill me in with today's date, 2014-09-15)
-- RFC PR: (leave this empty)
-- Rust Issue: (leave this empty)
+- Start Date: 2014-10-07
+- RFC PR: [rust-lang/rfcs#240](https://github.com/rust-lang/rfcs/pull/240)
+- Rust Issue: [rust-lang/rust#17863](https://github.com/rust-lang/rust/issues/17863)
 
 # Summary