Remove Rust/Cargo formulae

cargo-nightly.rb

@@ -1,16 +0,0 @@
-require 'formula'
-
-class CargoNightly < Formula
-  homepage 'http://crates.io/'
-  head 'http://static.rust-lang.org/cargo-dist/cargo-nightly-x86_64-apple-darwin.tar.gz'
-
-  # depends_on 'rust-nightly'
-
-  def install
-    system "./install.sh", "--prefix=#{prefix}"
-  end
-
-  test do
-    system "#{bin}/cargo"
-  end
-end

rust-nightly.rb

@@ -1,17 +0,0 @@
-require 'formula'
-
-class RustNightly < Formula
-  homepage 'http://www.rust-lang.org/'
-  head 'http://static.rust-lang.org/dist/rust-nightly-x86_64-apple-darwin.tar.gz'
-
-  conflicts_with 'rust', :because => 'same'
-
-  def install
-    system "./install.sh", "--prefix=#{prefix}"
-  end
-
-  test do
-    system "#{bin}/rustc"
-    system "#{bin}/rustdoc", "-h"
-  end
-end