A few fixes and additions about 30-seconds-of-code

[Chalarangelo]

Hey @atomiks, good ideas!

• First off, the deepFlatten bug has been fixed. My hasty copy-pasting was the cause for this, whoops!
• last and head of list should be updated to use slice() instead of indices, I have that in mind (PRs welcome).
• The randomIntegerInRange is perfectly ok by me, PR it and it should be good to go. Add a short explanation, like the one in randomNumberInRange and a test case and it should be fine.
• The medial one should probably be shortened somehow, but my brain has mostly shut down right now after so many hours working on these snippets. I'll check it out in the morning, you can PR it if you like though and I'll review it.

Remember to submit the changes to individual files, not the main README file. Thanks a lot for the contributions!

[atomiks]

PRs submitted

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