async

Lots of changes here!

First and foremost, we have a slick new site for docs. Special thanks to @hargasinski for his work converting our old docs to jsdoc format and implementing the new website. Also huge ups to @ivanseidel for designing our new logo. It was a long process for both of...

• retry and retryable now support an optional errorFilter function that determines if the task should retry on the error (#1256, #1261)
• Optimized array iteration in race, cargo, queue, and priorityQueue (#1253)

• Fixed a stackoverflow bug with detect, some, every on large inputs (#1293).

• Make bundle size smaller
• Create optimized hotpath for filter in array case.

• Fix auto bug when function names collided with Array.prototype (#1358)
• Improve some error messages (#1349)
• Avoid stack overflow case in queue
• Fixed an issue in some, every and find where processing would continue after the result was determined.
• Cleanup implementations of some, `ev...

• Added groupBy, and the Series/Limit equivalents, analogous to _.groupBy (#1364)
• Fixed transform bug when callback was not passed (#1381)

• Added support for ES2017 async functions. Wherever you can pass a Node-style/CPS function that uses a callback, you can also pass an async function. Previously, you had to wrap async functions with asyncify. The caveat is that it will only work if async functions are supported natively in your environment, transpiled implementations can't be detected. ([#1386](https://github.com/ca...