Update rust-installer. Fixes --help and interop with NixOS

brson · brson · commit cbef22e242fd · 2015-03-26T16:09:46.000-07:00
diff --git a/src/rust-installer b/src/rust-installer
@@ -1 +1 @@
-Subproject commit 60fd8abfcae50629a3fc664bd809238fed039617
+Subproject commit 49cc7f6fef12bdd77a0f8b182d9a64c371cb17c8
