Add support for generators

[bbqsrc]

This patch adds support for ES6 generators, without introducing any issues for older versions of node that don't support them.

It allows the use case like the following:

schedule.scheduleJob('someJob', someDate, function*() {
  const record = yield mongoose.model('Foo').findOne(someitem).exec();
  doStuffTo(record);
});

[tejasmanohar]

👍 overall... This is fair. It won't hurt usage in older versions of node but the tests will fail on older v of node. Maybe we should skip the generator tests on old versions of node (based on process.version) ? @bbqsrc

PS: could be a better way to do it, this is just my first thought

[bbqsrc]

@tejasmanohar yeah I just committed that. I forgot that JS does not approve of syntax errors.

This was meant to pass tests in 0.12 and 0.10, I simply derped. Waiting for that green light. 😄

[bbqsrc]

It's passing on everything now!

[tejasmanohar]

I forgot that JS does not approve of syntax errors.

hahahaha, i feel you :P

[tejasmanohar]

100% fine in my eyes. useful addition for those using the feature in es6/7 + no interference :)

[tejasmanohar]

💯 whoop

[bbqsrc]

Cheers! 👍

[tejasmanohar]

congrats! v0.5.0