vim plugin and elm updates

install/17-elm.sh

@@ -2,9 +2,5 @@
 source "$(dirname $0)/utils.sh"
 
 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/
+    npm install -g elm
 fi
-