$mdDialog.prompt should have a defaultValue option

[zbjornson]

I missed this when I made this config...

To be a full replacement for window.prompt, we should be able to provide a default value.

https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt

[ThomasBurleson]

PRs welcomed.

[devversion]

@zbjornson Already working on that? - Don't want to waste your work if already working on it :)

[zbjornson]

@devversion I can't do it until this weekend, so please go ahead! Thanks for checking :)