Closes #7 Add support for Elixir Phoenix

[fapdash]

@bkeepers All the commands are working except for strappy server.
Phoenix projects have a package.json file in the top directory and so the npm_server command is triggered.

$ ls
brunch-config.js  deps     mix.lock      package-lock.json  test
_build            lib      node_modules  priv               web
config            mix.exs  package.json  README.md

Would it be possible to make the npm_server check more specific?

[bkeepers]

Would it be possible to make the npm_server check more specific?

Definitely. Any suggestions on what the heuristics should be for detecting npm vs phoenix?

[fapdash]

Definitely. Any suggestions on what the heuristics should be for detecting npm vs phoenix?

By default Phoenix doesn't define a npm start script so checking for that should be enough. I've added a check to the change.

[bkeepers]

What if I have a package.json for node that doesn't have a start script? This is pretty common in npm modules.

[fapdash]

Maybe have the more specific check only for the server command?

[bkeepers]

Thanks @fapdash. I pushed a few fixes after testing it locally, but everything looks good now.