[elixir] add a convenience script for maintainers

[Ricky Elrod]

commit b68770af9fe466ae297368b42dd8fb03d34171a9
Author: Ricky Elrod <ricky(a)elrod.me&gt;
Date:   Wed Mar 12 05:22:56 2014 -0400

    add a convenience script for maintainers

 download-from-github.sh |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/download-from-github.sh b/download-from-github.sh
new file mode 100755
index 0000000..9f5c597
--- /dev/null
+++ b/download-from-github.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# (Note: This isn't used in the build at all, just a convenience script to
+# avoid having to copy-paste the download link from GitHub each update).
+
+if [ "$1" == "" ]; then
+  echo 'usage: ./download-from-github <elixir version>'
+  exit 1
+fi
+
+wget -O "elixir-$1.tar.gz" \
+  "https://github.com/elixir-lang/elixir/archive/v$1.tar.gz"