Undebug citation information generation

'echo' really does need the -e flag for generating the bibtex info; this commit
adds it back in.
Remove 'Version' from date list

The version tags are going to start having 'v' in front of them, so including the
word 'version' where they're listed is redundant.
Release version 0.2.2

Generate bibtex entry for the textbook and add to the book's
preamble automatically.