temp bash source fix, elm install scrip

install/17-elm.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+if not_installed "elm"; then
+    curl -L -o elm.gz https://github.com/elm/compiler/releases/download/0.19.1/binary-for-linux-64-bit.gz
+    gunzip elm.gz
+    chmod +x elm
+    sudo mv elm /usr/local/bin/
+fi
+