Move to using 0.1 versions of crates, rather than GH links

Also adds a fixme and does cargo update

Author: nrc

src/Cargo.lock

@@ -12,8 +12,8 @@ crate-type = ["dylib"]
 log = { path = "../liblog" }
 rustc = { path = "../librustc" }
 syntax = { path = "../libsyntax" }
-# FIXME should move rustc serialize out of tree
-rustc-serialize = "0.3"
 syntax_pos = { path = "../libsyntax_pos" }
-rls-data = { git = "https://github.com/nrc/rls-data" }
-rls-span = { git = "https://github.com/nrc/rls-span" }
+rls-data = "0.1"
+rls-span = "0.1"
+# FIXME(#40527) should move rustc serialize out of tree
+rustc-serialize = "0.3"