Promise support

[kahluagenie]

Currently this easily works with Bluebird.promisifyAll(require('spotify-node-applescript')), but I think it would be fantastic if the library supported promises out of the box.

[markstickley]

Seconded. I'm currently wrapping all callback functions in my code to give promise functionality!

[matthewnitschke]

I have created a fork which supports Promises. You can find it here.

Unless you guys think otherwise, I don't think I will create a pull request for it because the changes remove callback functions, making it not backwards compatible.

[lucasbento]

@matthewnitschke: awesome, can you add it to npm so others can use it easily? can be under spotify-node-applescript-promise name.

[matthewnitschke]

@lucasbento just added it. Can be downloaded via

npm install spotify-node-applescript-promise