Pull "readFile" util and the "uploadFile" test helper as it's own package.

[webark]

Ever thought about pulling just these two out into it's own package? I needed to create a custom file input, and the project as a whole didn't completely fit my needs, but these two things is exactly what I needed.

[jelhan]

I'm not quite sure if both will fit into one package. But pulling out uploadFile test helper might make sense since other projects like yours or ember-uploader need similar test helpers. Also formData test helper might fit into such a package. If we do so, we should rename uploadFile test helper to inputFile or something similar cause it only triggers a change event on an input file value. It's totally up to application if this fires an upload action or something else. I could also add similar ember-page-object helpers to such a package.