Expose IncomingFrame

[hoangphuoc25]

This will allow code written in async/await style, e.g.

const Promise = require('bluebird');
const stompit = require('stompit');
Promise.promisifyAll(stompit);

async function asyncEntry() {
    while (true) {
        let client = await stompit.connectAsync(connectOptions);        
        let message = await client.subscribeAsync(subscribeHeaders);
        let body = await message.readStringAsync('utf-8');
        console.log(body);
    }
}

[Dadibom]

I see no issues with this

[Dadibom]

Altough a cleaner solution would be to move IncomingFrame to it's own file

[paul-uz]

@gdaws can this get merged? I desparately need to use this library with async/await