Guess a soundcloud id from it's page url.
Useful for grabbing a streamable mp3 url for a given page:
var scid = require('scid')
scid('/flyinglotus/flying-lotus-kingmidas-lost', function (err, id) {
console.log('http://media.soundcloud.com/stream/' + id + '.mp3')
})
http://media.soundcloud.com/stream/kllR7tKcPnL3.mp3