Remove orange color and redundant bbcode for books.
Make tag replacement/transformation cover a few more cases and a bit less brittle.

Yes, I'm parsing HTML with regexp.
Yes, it's better than what it was doing before.
Yes, I want to do it better someday.
No, you don't get to bitch about it unless you're gonna fix it.
Make ISBNs tolerant of non-numeric characters.
Remove format stuff from ebook description generator.
Let X through ISBN sanitization, forgot trailing X's are needed sometimes.
Merge pull request #5 from bbcode/master

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