[PATCH] ob-shell-test, test-ob-shell and introduction

[Matt]

Hi,

I'm interested in getting async into ob-shell.el. Since I've never contributed 
before, I figure it'd be good to start with a few easy tasks.

It looks to me like the stdin and cmdline header args aren't documented 
anywhere (at least I couldn't find anything). To make sure I'm using them 
correctly before making a patch for the manual, here are some tests.

Please let me know if things look okay. It wasn't clear to me how to send along 
a message with git send-email, so I formatted these patches and included them 
as an attachment. Is that fine?

Thanks,
Matt

0001-ob-shell-test.org-Add-example-for-stdin.patch
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0002-test-ob-shell.el-Add-tests-for-stdin-and-cmdline-hea.patch
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