New Rule: no-forever-call

[nickschot]

forever is a yieldable constant exported by ember-concurrency. As most other exported yieldables are functions it's quite easy to write yield forever() which will not work. I propose a lint rule which guards against this.

docs: http://ember-concurrency.com/api/global.html#forever

Bad

@task
*example() {
  yield forever();
}

Good

@task
*example() {
  yield forever;
}