Promises and Async for actions

[dbanksdesign]

Some actions we might want to run asynchronously to speed up build times, others we might want to run synchronously in case there are later actions that depend on the output of previous actions. This will be a placeholder for thoughts on asynchronous v. synchronous actions.

[dbanksdesign]

Take a look at:

• https://caolan.github.io/async/docs.html#parallel
• https://caolan.github.io/async/docs.html#eachOf

Also, we should look into change platforms in the config file to an array rather than an object so we can be sure the order of operations.

[dbanksdesign]

Closing this issue. Actions can be asynchronous or synchronous code today, I don't think there is anything we need to do here.