npm can't retrieve elm-bin, returns response code 503

Trying to use grunt with elm, I followed the steps below from Mike Clark in https://groups.google.com/forum/#!searchin/elm-discuss/grunt/elm-discuss/ZuH6Mq8AEHU/uPt73DZSAQAJ

I'm not sure if this is the right place to submit this. any help would be appreciated. NOTE: you can put the offending url below in the browser and download the file.

steps: npm install -g grunt-cli --save-dev npm install grunt --save-dev npm install grunt-contrib-watch --save-dev npm install grunt-contrib-clean --save-dev npm install grunt-elm --save-dev

2.2.0 apollo:~/code/work/classes/pragmatic_studio/elm/bingo
$  npm install grunt-elm --save-dev
|
> elm@2.0.0 postinstall /Users/doug/node_modules/grunt-elm/node_modules/node-elm-compiler/node_modules/elm
> node lib/install.js

  ✖ https://raw.githubusercontent.com/kevva/elm-bin/2.0.0/vendor/osx/elm-platform-osx.tar.gz response code is 503 (Service Unavailable)
  ✖ elm pre-build test failed
  ✔ elm-make pre-build test passed successfully
  ✔ elm-package pre-build test passed successfully
  ✔ elm-reactor pre-build test passed successfully
  ✔ elm-repl pre-build test passed successfully

grunt-elm@1.3.0 ../../../../../../node_modules/grunt-elm
├── lodash@2.4.1
└── node-elm-compiler@0.4.0 (lodash@3.9.3, elm@2.0.0)
2.2.0 apollo:~/code/work/classes/pragmatic_studio/elm/bingo
$ grunt elm
>> Local Npm module "grunt-contrib-watch" not found. Is it installed?
>> Local Npm module "grunt-contrib-clean" not found. Is it installed?
>> Local Npm module "grunt-elm" not found. Is it installed?
Warning: Task "elm" not found. Use --force to continue.

Aborted due to warnings.
2.2.0 apollo:~/code/work/classes/pragmatic_studio/elm/bingo

kevva / elm-bin

npm can't retrieve elm-bin, returns response code 503 #32