Support per-instance authentication using Authorization: Bearer $TOKEN method

[tensiondriven]

I have been trying to adapt this gem to support the Authorization: Bearer $TOKEN method for authenticating using a token retrieved from OAuth.

I was able to hack in the header, but since the gem uses a singleton, every call to Asana::Anything will use the same credentials. In a common use case, this means one user's credentials can be set, and then another user in another session can use those credentials.

This seems a little backwards... IMHO the gem should /only/ support per-session authentication, since that's the most common use case.

To do this, we'd instantiate a new Asana object and pass it a $TOKEN or $API_KEY, that object would then use the supplied credentials for the life of the object. Calling Asana:: module directly shouldn't be allowed.

You can take a look at my modifications here: http://github.com/tronathan/asana - I'm happy to do the work to make this work as an instance object, but I need some pointers. Not sure how to make ActiveResource work that way.