fix(fromEventPattern): pass multiple arguments of event emitters to subscribe

[raycarter]

Description:
The situation is like the following code:

const EventEmitter = require('events').EventEmitter;
const Observable = require('rxjs').Observable;

const emitter = new EventEmitter();

const obs = Observable.fromEventPattern(function(handler) {
  emitter.on('test', handler);
});

obs.subscribe(args => {
  console.log(args); // expected ['a', 'b', 'c']
});

emitter.emit('test', 'a', 'b', 'c');

If multiple arguments are emitted from an event, only the first will be passed to subscribe. This PR changes it to pass an array of arguments to subscribe. A test case is added to spec.ts.

Related issue (#3048)

[rxjs-bot]

	Messages
📖

CJS: 1377.9KB, global: 745.8KB (gzipped: 118.6KB), min: 146.1KB (gzipped: 31.6KB)

Generated by 🚫 dangerJS

[coveralls]

Coverage increased (+0.002%) to 97.206% when pulling 2c0d440 on raycarter:fromEventPatternMultArgs into 8275cef on ReactiveX:master.

[kwonoj]

I'm going to close this PR for now as dupe of #2431, on discussion. I personally do not see huge need of this as selector argument allows this behavior.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.