Changes from PR

Updates from
https://github.com/clojure-cookbook/clojure-cookbook/pull/192 - good
stuff. I chose to skip the maven discussion because it's a bit
terrifying to contemplate, but could definitely get something in if it
feels like people might get tripped up without that.
Edits based on a re-read of the text
Tweak code after running through instructions
Merge pull request #242 from travis/lein-templates

Updates based on PR and re-reading/ test run through recipe