Allow CJS-style AMD to execute in require-order.

[matthewp]

Traditionally AMD executes all dependencies before executing a module. CommonJS, on the other hand, executes in require-order. That is, require determines the execution order.

When transpiling CJS to AMD this can cause a problem where a module written for CJS that contains a circular dependency where it depends on require execution order can break.

This change allows for CJS-style AMD modules to execute in require-order. There is a flag in Steal, executingRequire that triggers this. We turn this flag on in a CJS-style AMD module, and only execute dependencies up front, if those dependencies are listed before the first exports, module, or require dependency.

Closes #1483

[mjstahl]

I updated and the error below is what I got when using a dev-bundle:

I also tried a built version and got the following error: