Expose transit.encoder factory fn

[moll]

We expose transit.decoder so that users can decode already parsed JSON. However there is no analogous transit.encoder encoder factory function that takes an Object graph and returns the JSON Object graph prior to string serialization.

[abhishiv]

I would like that too!

I'm using transit for a not too big data structure, but one that changes too often - several times in a second, and calling JSON.parse to read the object from string seems to block the thread.

[glenjamin]

I'd like this too - when passing data from the server to the client via a JS literal, this allows skipping the intermediary string:

var __STATE = ["^", // ...
// vs
var __STATE = '["^", // ...