adding tests for exit codes

[boneskull]

I rebased this branch (fix/333) against master, and added tests for #1297 in 7c4ba93.

@travisjeffery If you're happy with dc8fcf6, I will go ahead and merge it all into master.

[jbnicolai]

I rebased this branch (fix/333) against master, and added tests for #1297 in 7c4ba93.

Wouldn't it have been cleaner to consider the rebase onto master (which is a good thing of itself!) and the extra test two separate issues?

1. rebase visionmedia:fix/333 on top of visionmedia:master and force push
2. branch of visionmedia:fix/333 to boneskull:fix/333
3. commit the test
4. create this pr, boneskull:fix/333 -> visionmedia:fix/333

Because right now there's a needlessly huge diff which I can't really read or understand 😉

[boneskull]

@jbnicolai I was having problems getting the test working w/o the rebase.

Anyway, I could do that, or I could just tell you that the only changesets you would be interested in are:

• dc8fcf6
• 76e0851
• 7c4ba93

If this is insufficient let me know.

[jbnicolai]

Was only telling you because that workflow would've been easier for you as well ;-), see the referenced PR above this comment for an example.

[jbnicolai]

Other than that it looks good to me 👍