Paraphrase transcript of 2012-12-05 for improved readability

Formatting in this commit aims to make it easier to read the transcript notes. Now, while it's no longer a verbatim drop of the chat logs, it hopefully doesn't stray too far from the original source either.

Also removes the plain message lines outside of code blocks. Would blockquote the whole thing, but that seemed excessive for a test commit to see if it should be done on other transcripts to this commit's fashion.

Couldn't quite work out what Day 2's first question was referring to though.

This one might be a little too drastic. Feel free to close without merging if it changes too much of the intended history/logs of the class.