Support chunk options for stitch()?

[wibeasley]

(Issue split off from #33)
The stitch() function doesn't currently support chunk options, just chunk names. @yihui requested that I open an issue to serve as a reminder.

I wasn't necessarily advocating that stitch() implement chunk options. Let me play the devil's advocate for a moment. It may be preferable to keep things as you have them, and avoid adding complexity to a derivative function like stitch() because,

1. a simpler function may be easier for less experienced users to start with.
2. its additional functionality is one more thing you have to maintain and regression test.

As long as the documentation redirects the user to the appropriate function, I don't have a strong opinion either way.

[yihui]

It is supported in the development version of knitr now. Thanks!

BTW, I meant to ask you to file the issue to the knitr repo instead of the knitr-examples repo here, but that is no big deal :)